This is the 877th most frequent Korean word.
맞는
"맞는" means "correct," "suitable," or "fitting."
Here, '맞는' is used to imply correctness, i.e., the book that is correct or matches the criteria.
이 책이 맞는 책인가요?
Is this the correct book?
In this sentence, '맞는' is used to mean aligning or agreeing with, indicating compatibility with someone's opinion.
당신의 의견에 맞는 결정을 하겠습니다.
I will make a decision that aligns with your opinion.
Here, '맞는' suggests suitability or a proper fit, specifically referencing the appropriateness of the clothes' size.