can't cut the mustard
口语·表示不能胜任或达标
例句
He was hired as a manager, but after a month, it was clear he couldn't cut the mustard and was let go.
典故来源
源自19世纪美国俚语，可能源于军队或厨房中“切芥菜”的比喻，表示无法达到标准或胜任任务。