To move back or away from something.
He ret back from the edge of the cliff.
그는 절벽 가장자리에서 물러났다.
To put something back where it belongs.
She ret the book to the library.
그녀는 도서관에 책을 반납했다.
To give something back to the person it came from.
The company ret the money to its customers.
회사는 고객에게 돈을 환불했다.