One syllable: Caulk.
kahk
/kɑk/
Caulk is pronounced kahk (/kɑk/). It has one syllable (Caulk), with the stress on "Caulk". Caulk refers to a material—typically a flexible, waterproof sealant—used to fill joints or gaps in structures to prevent air, water, or pests from passing through. It can be a noun (the material itself or a patch) or a verb meaning to seal with caulk. In construction and home repair contexts, it denotes a pliable filler that remains soft and adherent after application.
nounCaulk refers to a material—typically a flexible, waterproof sealant—used to fill joints or gaps in structures to prevent air, water, or pests from passing through. It can be a noun (the material itself or a patch) or a verb meaning to seal with caulk. In construction and home repair contexts, it denotes a pliable filler that remains soft and adherent after application.
"The carpenter ran a bead of caulk along the kitchen sink to stop the drip."
"They repaired the window frame by caulking the gaps with silicone caulk."
"Weatherproof caulk was applied around the baseboard to seal drafts."
Caulk is pronounced with a single syllable /kɔːk/ in US and UK English. The mouth forms a rounded, open-mid back vowel followed by a velar stop; the final consonant is a voiceless plosive. Imagine saying 'cork' without the r. Stress is on the only syllable; there is no vowel length contrast beyond the typical stressed monosyllable. See also the audio reference in Pronounce or Cambridge for listening.
Common errors include adding a 'l' sound in the middle (pronouncing 'caulk' as 'caulk-l' or 'ca-ulk'), or pronouncing it as 'cauk' with a diphthong that slides to an 'ee' or 'ay' sound. The correct US/UK value is a pure /ɔː/ vowel followed by /k/. To correct, keep the tongue back and low-mid, avoid trailing vowel, and end with a clean /k/. Practice with minimal pairs like 'caulk' vs 'cork' to notice the vowel shift and the silent 'l' avoidance.
In US, UK, and AU, the word is monosyllabic with /kɔːk/. Differences lie in rhoticity and vowel quality: US tends to maintain a pure /ɔː/ in flat accent; some UK variants may show a slightly shorter or broader /ɔː/ depending on regional rhotics; AU generally follows non-rhotic patterns with a clipped or broader /ɔː/. All share the final /k/ pressure, with minimal onset consonant blending. Listen to native speakers via Forvo or YouGlish for regional nuance.
The difficulty comes from the monosyllabic structure and the 'l' consonant clash in fast speech, plus the back open-mid vowel /ɔː/ which is sensitive to surrounding vowels and dialect. Many speakers anticipate a long vowel or insert a schwa; some replace /ɔː/ with /ɒ/ or /ɑː/ depending on accent. The key challenge is maintaining a crisp final /k/ without voicing or following vowel. Focus on keeping the tongue high back, lips rounded, and finishing with a clean stop.
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Caulk originates from Middle English calk, from Old Norse kalka meaning to rub or strike with a hard tool, evolving into the sense of filling gaps with a sealing material. The modern meaning—an elastic sealant used to fill joints—gained prominence in the 19th and 20th centuries with the expansion of building technologies. Initially, caulking materials were derived from natural substances like lime-putty and animal skins; the advent of petroleum-based sealants in the 20th century, followed by silicone and acrylic caulks, expanded their applications. The term cemented its place in construction jargon as
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Help others use "Caulk" correctly by contributing grammar tips, common mistakes, and context guidance.
💡 These words have similar meanings to "Caulk" and can often be used interchangeably.
🔄 These words have opposite meanings to "Caulk" and show contrast in usage.
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Words that rhyme with "Caulk"
-alk sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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