Korean · Pronunciation Guide
chat-tta. The ㅊ needs a real puff, the ㅈ batchim collapses into an unreleased t, and that stop then tenses the ㄷ into ㄸ.
chatda
Two beats with a silence wedged between them. Three separate processes fire inside one two-syllable word -- aspiration at the front, batchim neutralization in the middle, tensing at the back -- which makes it a compact summary of Korean consonant phonology.
Listen: 찾다
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열쇠를 못 찾겠어요.
Yeolsoereul mot chatgesseoyo.
I can't find the keys.
Listen: 열쇠를 못 찾겠어요.
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열쇠를 못 찾겠어요 stacks two of these. The unreleased t of 못 runs straight into the aspirated ㅊ of 찾, so the closures merge into one held stop released with a puff, and then the neutralized ㅈ of 찾 tenses the ㄱ of 겠: chat-kke-sseo-yo.
The instinct is to pronounce the ㅈ, giving 'chaj-da' with an audible affricate closing the first syllable. Korean never permits that in final position. Learners also under-aspirate the opening ㅊ and soften the ㄸ, which flattens a word built almost entirely on consonant contrasts into a bland 'chad-da'.