Korean · Pronunciation Guide
dat-tta. Three ㄷ letters on the page and not one of them is a plain English d: a light initial stop, a silent closure, and a tensed ㄸ.
datda
Two beats around a held closure. The word is a useful demonstration that a single Korean letter has at least three distinct realizations depending on where it sits -- and all three of them appear here inside four sounds.
Listen: 닫다
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창문을 닫아 주세요.
Changmuneul dada juseyo.
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Listen: 창문을 닫아 주세요.
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창문을 닫아 주세요 conjugates to 닫아, where the batchim resyllabifies forward and voices into a genuine d: da-da. The consonant that was silent in 닫다 becomes the softest sound in 닫아, which is about as complete a reversal as Korean phonology offers.
The middle t gets released with an English burst and the final one gets softened -- the standard double error, and neither half is right. Hold that closure genuinely silent, because an audible release turns the first syllable into something that sounds like a separate word.