Throw in the towel  백기를 들다, 포기하다

To throw in the towel simply means to quit something.
‘Throw in the towel’은 무언가를 관둔다는 의미입니다.

When was the last time you threw in the towel?
가장 최근에 무언가를 포기한 게 언제인가요?

I was trying to learn Chinses for a long time, but in the end I got frustrated and threw in the towel.
오랫동안 중국어를 배우기 위해서 노력했지만 결국 좌절화고 포기하게 됐어.