to wing it 即興發揮(俚語)
英文釋義
To do something without any planning or preparation.
例句
Usually I prepare for a speech carefully, but yesterday I was asked to speak at the conference without any warning, so I had to wing it.
我通常很認真地準備演講,但昨天有人突然請我在會議上講話,我只好即興發揮。