give somebody up for lost
成語所屬單字lost
give somebody up for lost — 慣用語
1. To stop hoping that someone who is missing is still alive.
1.慣用語
釋義
放棄某人（認為已死）
To stop hoping that someone who is missing is still alive.
例句
After three days, the rescue team gave the hiker up for lost.
The family refused to give their son up for lost.