Korean · Pronunciation Guide
geo-meun-saek. The ㅁ ending 검 slides forward into 은, and the vowel in the middle is ㅡ, a sound English simply does not possess.
geomeunsaek
Three even beats. The timing quirk is the resyllabification at 검+은, which erases the syllable boundary you see on the page: three blocks are written and three syllables are spoken, but they are cut in different places.
Listen: 검은색
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저는 검은색 가방을 샀어요.
Jeoneun geomeunsaek gabangeul sasseoyo.
I bought a black bag.
Listen: 저는 검은색 가방을 샀어요.
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저는 검은색 가방을 샀어요 places 검은색 before 가방, and the unreleased k of 색 tenses the ㄱ of 가 to ㄲ -- geo-meun-saek-kka-bang. Meanwhile 가방을 links its ㅇ into the particle, so the whole phrase runs with no internal silence except that one stop closure.
ㅡ is the hardest Korean vowel for English speakers, and the usual substitutes are 'oo', which rounds the lips, or 'uh', which drops the tongue. Neither works: keep the tongue high and the lips spread, as if saying 'ee' with the tongue pulled straight back. Get it wrong and the middle syllable turns into 문 or 만, neither of which belongs in this word.