to throw one's hand in
01
見切りをつけて降りる, 諦めて手を引く
to give up doing something or stop being a part of something, particularly due to seeing no way of success
例
After months of failed negotiations, the union threw its hand in.
何か月もの交渉が失敗に終わり、組合は見切りをつけて降りた。
