Korean · Pronunciation Guide
yuh-sut -- two syllables built on the same unrounded ㅓ vowel, ending in the same silent stop as 다섯.
yeoseot
Two beats of similar weight, the second clipped by the stop. Repeating the same vowel twice makes this a good drill word for ㅓ -- if the two syllables do not sound like they rhyme, one of them has drifted toward a rounded vowel.
Listen: 여섯
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여섯 시에 만나요.
Yeoseot sie mannayo.
Let's meet at six.
Listen: 여섯 시에 만나요.
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여섯 시에 만나요 brings the tensing rule back: the unreleased t of 여섯 hardens the ㅅ of 시 into ㅆ, so it lands as yeo-seot-ssi. And 시 itself is 'shi' rather than 'si', because ㅅ palatalizes in front of ㅣ.
English speakers routinely say 'yo-seot', importing a rounded vowel into the first syllable. ㅕ is a y-glide plus the unrounded ㅓ, so the lips stay slack all the way through. Combine that with the usual over-release of the final t and the word ends up with three syllables instead of two.