Definition
To behave in a way that embarrasses or disappoints a group of people one is associated with.
令團體失望；使自己人難堪
He made a critical error in the game, letting the side down.
他在比賽中犯了一個關鍵錯誤，讓團隊失望。
She didn't finish the report on time, which let the whole project team down.
她沒有按時完成報告，這讓整個項目團隊失望。
They had a chance to win, but their leader let the side down at the last minute.
他們有機會贏得比賽，但他們的領導在最後一刻讓團隊失望。