r/r/
Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
How to pronounce reinforce in American English
ree·ihn·FORS
Start here
Americans pronounce reinforce as ree-ihn-FORS (/ˌriɪnˈfɔrs/). Stress falls on the third syllable — keep everything else short and quick. You'll hear it in sentences like "I rewrote my notes after class to reinforce the lecture content".
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Sound by sound
Every sound in "reinforce".
3 syllables, 7 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
ih/ɪ/
Drop your jaw slightly with relaxed lips. Touch the tongue tip behind the bottom front teeth and arch the top-front toward the roof.
n/n/
Touch the tip or front edge of your tongue to the roof of your mouth behind your teeth. Air flows through your nose.
f/f/
Lift your bottom lip to touch the very bottom of your top front teeth. Blow air through this contact point without voicing.
or/ɔr/
Start with the 'aw' jaw drop and rounded lips. Pull the tongue back and up while keeping the lips rounded for the R.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
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Watch out
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
01
Stressing the wrong syllable.
Stress falls on the third syllable, not the others. Stretch FORS — keep everything else short and quick.
REE·IHN·fors→REE·ihn·FORS
02
Pronouncing the "R" too clearly.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.
… (no R)→… r (curl the tongue)
Questions
Questions people ask about this.
How is "reinforce" stressed in American English?
Stress falls on the third syllable — say "FORS" with a longer, fuller vowel and keep every other syllable short and quick. The respell "ree-ihn-FORS" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
How do I pronounce the R in "reinforce"?
Americans use a relaxed retroflex R: the tongue curls back rather than rolling, and the R is one continuous sound with the vowel before it — not two separate sounds. Don't try to pronounce a separate vowel followed by a separate R. Treat them as a single shape.
Is the American pronunciation of "reinforce" different from British English?
American English uses different vowel shapes, a relaxed retroflex R, and connected-speech tricks like flap-T and glottal-stop T that British Received Pronunciation generally avoids. The respell "ree-ihn-FORS" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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