This is the 14972nd most frequent Korean word.
반환할
"반환할" means "to return" or "to give back."
The word '반환하다' implies the action of returning an item that was borrowed or taken temporarily.
도서관에서 빌린 책을 다음 주까지 반환해야 합니다.
You must return the book borrowed from the library by next week.
Here '반환하다' is used to denote the action of refunding or giving something back in accordance to a prior agreement.
계약 조건에 따라서 계약금을 반환해야 할 의무가 있습니다.
According to the contract terms, there is a duty to refund the contract deposit.
In this case '반환하다' refers to the act of reimbursing or returning money associated with a transaction.