How to pronounce brightens in American English

Stress falls on the first syllable — say "BRAHY" with a longer, fuller vowel and keep every other syllable short and quick. The respell "BRAHY-tuhnz" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.

It isn't fully silent — the T closes off into a tiny throat catch called a glottal stop, then the next sound comes through. The respell "BRAHY-tuhnz" reflects the audible result. Americans use this glottal-stop T whenever a /t/ sits between a stressed vowel and an N (or another /t/-like consonant) at the end of a word.

Unstressed syllables in American English collapse toward a schwa — a lazy, neutral "uh" sound. The full vowel is what textbooks teach, but in actual American speech every unstressed vowel reduces. The respell "BRAHY-tuhnz" shows the reduced form so you can hear the casual rhythm directly.

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 "BRAHY-tuhnz" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.