Indonesian reduplication (kata ulang) is doubling a word — like orang-orang (people, plural), berjalan-jalan (to stroll), or kuda-kuda (sawhorse — different meaning than "kuda" = horse). It has three main types: full reduplication (orang → orang-orang), partial reduplication (lelaki from laki, "men"), and modified reduplication (sayur-mayur, where the second word changes). Reduplication forms plurals, intensifies, expresses variety, or creates new meanings.
Reduplication is one of the most distinctive features of Indonesian grammar. Unlike European languages where plurals are formed by adding endings (-s, -es, -i), Indonesian frequently repeats the entire word. But reduplication does much more than plurals — it's a versatile tool for changing meaning.
The 3 types of Indonesian reduplication
1. Full reduplication (perulangan utuh)
Repeat the whole word, connected by a hyphen in writing:
- orang (person) → orang-orang (people)
- buku (book) → buku-buku (books)
- rumah (house) → rumah-rumah (houses)
- anak (child) → anak-anak (children)
- kuda (horse) → kuda-kuda (sawhorse, training stance — different meaning!)
2. Partial reduplication (perulangan sebagian)
Only the first syllable is repeated, often with a vowel change. This is less common in modern Indonesian:
- laki (male) → lelaki (man — note the partial repetition)
- tetangga (neighbor) — historical partial reduplication
- tetamu (guest, archaic) — same origin
Partial reduplication is mostly frozen in older words — it's not productive in modern Indonesian.
3. Modified reduplication (perulangan berubah bunyi)
The word is repeated but with a sound change in the second copy:
- sayur (vegetable) → sayur-mayur (all sorts of vegetables)
- warna (color) → warna-warni (colorful, various colors)
- bolak-balik (back and forth, from "balik" = return)
- compang-camping (ragged, tattered)
- kacau-balau (chaotic mess)
This type often expresses variety, randomness, or messiness.
What reduplication does
A. Plural marker
- orang (person) → orang-orang (people)
- negara (country) → negara-negara (countries)
Note: plural reduplication is only used when number is unclear. With a number ("tiga orang"), don't reduplicate: ❌ "tiga orang-orang", ✅ "tiga orang".
B. Verb intensification or repetition
- berjalan (to walk) → berjalan-jalan (to stroll, walk around)
- berbicara (to talk) → berbicara-bicara (to chat at length)
- mencari (to look for) → mencari-cari (to search frantically)
C. Variety / "all sorts of"
- buah → buah-buahan (all kinds of fruits)
- sayur → sayur-mayur (assorted vegetables)
- warna → warna-warni (multicolored)
D. New meaning (lexicalized)
- mata (eye) → mata-mata (spy)
- kuda (horse) → kuda-kuda (sawhorse, fighting stance)
- main (to play) → main-main (to play around, not be serious)
- hati (heart) → hati-hati (careful, watch out!)
These reduplicated forms have meanings unrelated to a simple "plural" of the base word.
E. Reciprocal action
- memukul (to hit) → pukul-memukul (hit each other)
- tolong (help) → tolong-menolong (help each other)
F. Continuous or habitual aspect
- baca → baca-baca (read leisurely / look around at reading material)
- makan → makan-makan (eat together casually, snack around)
Orang-orang di Jakarta sangat sibuk.
People in Jakarta are very busy.
Plural reduplication.
Saya suka jalan-jalan di pagi hari.
I like to stroll in the morning.
jalan-jalan = leisurely walk, not just "walking".
Hati-hati di jalan!
Be careful on the road!
Idiom — "hati-hati" = watch out.
Jangan main-main, ini serius.
Don't fool around, this is serious.
main-main = to play around / not be serious.
Pasar tradisional menjual sayur-mayur segar.
Traditional markets sell all kinds of fresh vegetables.
Modified reduplication for variety.
Tiba-tiba dia menangis.
Suddenly she cried.
Idiom from "tiba" — fully lexicalized.
Lampu warna-warni menghiasi jalan.
Multicolored lights decorate the street.
Modified reduplication: warna → warna-warni.
Tolong-menolong itu wajib di antara tetangga.
Mutual help is mandatory among neighbors.
Reciprocal reduplication.
Kira-kira jam berapa kamu sampai?
About what time will you arrive?
kira-kira = approximately.
Anak-anak sedang belajar di sekolah.
The children are studying at school.
Plural reduplication.
While reduplication is everywhere in Indonesian, learners often misuse it. Understanding when not to reduplicate is as important as knowing when to.
Rules to remember
- Don't reduplicate with a number: "tiga orang-orang" is wrong. Use "tiga orang" (three people). The number itself signals plural.
- Don't reduplicate after "para" or "banyak": "para mahasiswa" (the students), "banyak orang" (many people) — no reduplication needed, these words already mark plurality.
- Hyphenate in writing: orang-orang, not orangorang or orang orang.
- Pronounce both copies fully: don't shorten the second word in speech.
- Reduplicated forms can take prefixes/suffixes: ber-jalan-jalan, buah-buahan, ke-anak-anakan (childish).
Common foreigner mistakes
- Always reduplicating to mark plural: "Saya membeli buku-buku" sounds heavy/over-formal in conversation. Often "Saya beli buku" (I bought books) is fine — the verb context shows plural implicitly.
- Misusing lexicalized reduplications: "mata-mata" doesn't mean "two eyes" — it means "spy". "Saya punya mata-mata" = "I have spies", not "I have eyes". (For "two eyes" use "dua mata".)
- Reduplicating with numbers: ❌ "lima ekor kucing-kucing" — wrong. ✅ "lima ekor kucing".
- Treating jalan-jalan as plural of "road": "jalan-jalan" usually means "to stroll/travel", not "many roads". Context matters.
- Forgetting -an in buah-buahan: "all sorts of fruits" requires the suffix — just "buah-buah" alone is unusual.
Reduplication in fast/informal speech
In casual conversation, Indonesians often write reduplications using a "2" superscript: orang² for orang-orang, jalan² for jalan-jalan. This is informal-only (texting, social media, casual notes) — never use it in formal writing.
Comparison with English
English does reduplication too, but rarely and informally: "bye-bye", "night-night", "so-so", "no-no". Indonesian uses it productively across all word classes — making it a defining feature of the language. Mastering reduplication is a key step from beginner to intermediate Indonesian: it signals you understand the language structurally, not just word-by-word.
Frequency in real Indonesian
In a typical 10-minute Indonesian conversation, expect to hear:
- 5-10 lexicalized reduplications: hati-hati, kira-kira, tiba-tiba, jalan-jalan
- 2-3 plural reduplications: orang-orang, anak-anak
- 1-2 variety reduplications: buah-buahan, sayur-mayur, warna-warni
Learn the lexicalized ones first — they're fixed vocabulary you can use immediately. The grammatical reduplications (plurals, verb modification) come naturally with practice.
Is reduplication the only way to make Indonesian plurals?+
No — Indonesian rarely marks plural at all. Context usually carries the meaning. "Saya punya buku" can mean "I have a book" or "I have books" depending on context. Reduplication ("buku-buku") emphasizes plurality, but you can also use number words ("banyak buku" = many books), the article "para" (para guru = the teachers), or simply let context handle it.
Why does jalan-jalan mean "to stroll" instead of "many roads"?+
"Jalan" has two meanings — "road" (noun) and "to walk" (verb). When reduplicated as "jalan-jalan", it becomes a lexicalized expression meaning "to stroll, travel, take a walk for pleasure". This is a verb-intensification reduplication: doing the action repeatedly or leisurely. Context tells you it's the verb meaning, not the plural noun.
How do you write reduplication?+
In formal Indonesian, always with a hyphen: orang-orang, jalan-jalan, anak-anak. Older texts (pre-1972 spelling reform) sometimes used a "2" superscript: "orang²", but this is now reserved for informal handwriting, texting, and social media. Never use it in essays, business writing, or news.
Can I reduplicate any word?+
Most root words can be reduplicated, but the meaning may be lexicalized (idiomatic) rather than predictable. "Tidur" (sleep) → "tidur-tidur" means to doze around / nap casually, not "to sleep many times". Stick to well-known reduplications (orang-orang, jalan-jalan, hati-hati, main-main, anak-anak, sayur-mayur, buah-buahan) before inventing your own.
What is the difference between buah-buah and buah-buahan?+
"Buah-buah" (just the doubled noun) is rarely used. The natural form is "buah-buahan" with the -an suffix, meaning "all sorts of fruits / various fruits". The -an suffix adds the "variety / generic category" meaning. Same pattern: sayur-sayuran (various vegetables), kayu-kayuan (various woods).
Should I use reduplication in formal writing?+
Yes — formal writing uses reduplication freely and explicitly, with proper hyphens. In casual speech you can drop it when context makes plurality clear, but in business letters, news articles, government documents, and academic writing, use the full reduplicated forms. The "2" superscript shortcut is strictly informal.
Master Indonesian reduplication with IndoLingua
Learn when to double words for plural, intensification, or new meaning — through lesson dialogues and exercises. Free plan: 10 lessons. Full 3-day trial: card required, nothing charged during the trial.
Start learning free
