게 다지다

chop finely; pack down

다지다 is chopping something down small, and in these lines it is nearly always 잘게 다지다, 'chop it finely' — the standard instruction in cooking captions: 당근은 잘게 다져주세요. The related noun 다짐육 is mince. It has a second sense of firming or packing something down, which is what 근육을 이렇게 다지는 걸 좋아한다 points at.

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