Syllable Division (dělení slov) | Czech Grammar

Dělení slov — dividing a word across two lines with a hyphen — is a typesetting concern, not something you decide when speaking. But it follows real rules, and they are not the English ones. English breaks words largely by etymology and by rules about how many letters may be stranded; Czech breaks them mainly by syllable, and its notion of a syllable includes the vowel-less syllables built on a syllabic r or l. If you write Czech in a document, an email signature, or a poster, these rules decide where a hyphen may go — and getting them wrong looks as jarring to a Czech as th-rough looks to you.

The core principle: divide by syllable

A word may be split only at a syllable boundary. Every syllable must contain a nucleus — normally a vowel, but in Czech a syllabic r or l counts too. That single fact resolves most cases.

ze-le-ni-na

vegetables — four open syllables, so three legal break points.

vo-da

water — one break point, between the syllables vo and da.

Because zelenina has four vowels it has four syllables and can be broken in three places (ze-lenina, zele-nina, zeleni-na). Voda has two syllables and one break point. You never break inside a syllable.

Na trhu prodávali čerstvou zeleninu.

They were selling fresh vegetables at the market. — zeleninu could break as ze-le-ni-nu at a line end.

Words that cannot be divided at all

A one-syllable word has no internal boundary, so it can never be hyphenated — and crucially, this includes the vowel-less words that ride on a syllabic r or l. Vlk, prst, krk, smrt, plst are each one syllable and stay whole no matter how tight the line.

vlk

wolf — one syllable (the l is the nucleus), so it can NEVER be split.

prst

finger — one syllable around a syllabic r; indivisible.

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The syllabic-r/l words look long and consonant-heavy, so the instinct is to split them — but they are single syllables. Vlk, prst, krk, smrt, čtvrt, scvrkl all stay in one piece. If there is no vowel and no syllabic r/l boundary, there is nothing to break.

Where the break goes inside a word

Once a word has two or more syllables, where exactly does the hyphen fall?

A single consonant between vowels goes with the following syllable. voda → vo-da, země → ze-mě. Where a cluster follows, Czech usually allows a choice: matka may break mat-ka (the common, morpheme-respecting split) or ma-tka, and both are accepted in print.

ze-mě

earth/ground/country — single m goes to the second syllable: ze-mě.

Consonant clusters are split to leave a pronounceable onset on the second syllable, but Czech is fairly permissive and often allows more than one division. sestra may be broken se-stra (keeping str together as an onset) or ses-tra; both are accepted. kastrol → ka-strol or kas-trol.

Moje se-stra je o dva roky mladší.

My sister is two years younger. — sestra breaks as se-stra or ses-tra.

Dej ten guláš do velkého ka-strolu.

Put that goulash in the big pot. — kastrol: ka-strol / kas-trol.

Morpheme boundaries are respected

Where a word has a clear prefix or a clear compound seam, the division prefers that morpheme boundary over a purely phonetic split. This is the point at which the word-formation structure of the word overrides the raw syllable rule.

roz-umět (understand) — not ro-zumět; the prefix roz- is kept intact.
pod-pis (signature) — the prefix pod- stays whole.
nej-lepší (best) — the superlative prefix nej- is a natural seam.
před-platné (subscription) — prefix před- preserved.

Musíš tomu roz-umět, ne se to naučit nazpaměť.

You have to understand it, not memorize it. — rozumět breaks at the prefix: roz-umět.

Chybí tu tvůj pod-pis.

Your signature is missing here. — podpis breaks at the prefix seam: pod-pis.

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When you can see a prefix (roz-, pod-, nad-, od-, před-, bez-, nej-) or a compound seam, break there. This overrides the plain "single consonant goes forward" rule: rozorat is roz-orat, not ro-zorat, even though a bare syllable rule would suggest otherwise.

Digraphs stay together

The digraphs ch, dz, and dž each spell a single sound and are treated as an indivisible unit — you never split them across a line, any more than you would split English sh.

Ta ku-chy-ně je hroz-ně ma-lá.

That kitchen is terribly small. — kuchyně: the ch is a single unit, so the break falls ku-chyně, never kuc-hyně.

mu-cha

fly (insect) — the ch is one unit, so the break is mu-cha, never muc-ha.

So mnich (monk) breaks as mni-ch? No — mnich is one syllable and does not break; but in a longer word like ma-chr (colloquial: an expert) the ch stays whole. The rule is simply: never let a hyphen fall between the two letters of ch, dz, or dž.

The single-letter rule

You may not strand a single letter on its own line. Even though oko (eye) is phonetically o-ko, you must not break it, because that would leave a lone o at the end of the first line (or a lone start on the second). The same blocks o-sel, u-cho as line breaks. Practically, a word that would only split by orphaning one letter is left unbroken.

oko

eye — phonetically o-ko, but you may not break it: that strands a single letter.

Máš krásné modré oči.

You have beautiful blue eyes. — oči likewise resists division; leave it whole.

Foreign words

Loanwords follow the same syllable-based logic once they are czechized, but a recognizable foreign morpheme boundary is respected where it is transparent: demo-krat / demokra-t… (the second orphans a letter, so demo-kra-cie is safer), atmo-sféra. When in doubt with an unfamiliar foreign word, break by pronounceable syllables and never strand a single letter. See foreign-word spelling for how these words are adapted in the first place.

Ve městě je špatná atmo-sféra.

There's a bad atmosphere in town. — atmosféra: atmo-sféra keeps a pronounceable onset.

Common Mistakes

Because the "wrong" versions here are hyphenation choices, the ❌ shows an illegal or English-style break and the ✅ shows a legal Czech one.

❌ vl-k

Wrong — vlk is one syllable (syllabic l); it cannot be divided at all.

✅ vlk

Correct — leave it whole (wolf).

❌ ro-zumět

Wrong — the prefix roz- must be kept intact.

✅ roz-umět

Correct — break at the prefix seam (to understand).

❌ muc-ha

Wrong — the digraph ch is a single unit and cannot be split.

✅ mu-cha

Correct — break before the whole ch (a fly).

❌ o-ko

Wrong — this strands a single letter, which is not allowed.

✅ oko

Correct — leave it unbroken (an eye).

❌ pod-pis written as po-dpis

Wrong — English-style phonetic split ignores the prefix pod-.

✅ pod-pis

Correct — respect the prefix boundary (a signature).

Key Takeaways

Divide by syllable, and remember a syllabic r or l counts as a nucleus — so vlk, prst, krk are one syllable and cannot be split.
A single intervocalic consonant goes with the following syllable (vo-da, ze-mě); clusters often allow more than one legal break (se-stra / ses-tra).
Morpheme boundaries win: keep prefixes whole (roz-umět, pod-pis, nej-lepší).
Digraphs ch, dz, dž never split, and you may never strand a single letter (so oko stays whole).
This is a typesetting rule — it never affects how you pronounce or otherwise write the word.

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