Korean · Pronunciation Guide
bu-teo. The ㅂ at the start is plain and almost voiceless, while the ㅌ in the middle is aspirated and needs a real puff of air.
buteo
Two unstressed beats attached to a noun of time or place. The contrast between the two consonants is the useful thing to rehearse -- a plain stop at the front and an aspirated one in the middle, packed into a word short enough to hear both clearly.
Listen: 부터
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아침부터 일해요.
Achimbuteo ilhaeyo.
I work from the morning.
Listen: 아침부터 일해요.
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아침부터 일해요 attaches 부터 to 아침, and the ㅁ of 침 links straight into the ㅂ with the lips already closed, so the transition is one continuous lip closure that shifts from nasal to stop. That is why the join sounds tighter than the spelling implies.
Because English flaps intervocalic t, learners say 'bu-duh' and lose the aspiration entirely, pushing the word toward 부더. Korean keeps aspirated consonants aspirated wherever they sit. And do not round the second vowel into 'boo-toh': ㅓ needs slack lips, and only the first vowel in this word is rounded.