Chinese · Pronunciation Guide
yee-HWAR: the 一 has become a rising tone here, and the second syllable ends in an r-colouring that swallows the vowel's ending.
yíhuìr
Two things at once. 一 converts to a rising tone because huì falls — the same branch of the rule as in 一样. And the r-suffix attaches to the end, altering the vowel's finish without touching the tone, which survives the suffixation unchanged. The word is a compact demonstration of both processes.
Listen: 一会儿
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请等一会儿。
Qǐng děng yíhuìr.
Wait a moment, please.
Listen: 请等一会儿。
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请等一会儿。 opens with qǐng and děng adjacent, both dipping, so qǐng rises. Then yí climbs and huìr plunges. The request therefore runs rise, dip, rise, fall — four syllables and four different pitch movements, with a third-tone conversion and a 一 conversion sitting next to each other.
Saying yī with a flat tone ignores the conversion that natives apply automatically. The r-suffix is the other issue: learners give it a separate beat, producing "hway-er", when it should fuse into the vowel and take no extra time. And the qǐng děng conversion at the start is easy to skip because both syllables belong to different words.