couple; pair; piece; partner; mate

Explanation

1. couple; pair; piece; partner; mate
Either one or both of two things that form a pair or set.

2. piece
A unit of counting pieces that form a pair or set.

3. man; woman
(slang) A partner.

4. comparison
The word that indicates an incomparably extreme degree.

Examples
맞는 짝
짝이 되다
짝을 고르다

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