VERB
即興演出，臨時插入（腳本或講稿中沒有的臺詞）
If you ad-lib something in a play or a speech, you say something which has not been planned or written beforehand.
例句
He began comically ad-libbing a script...
他即興調侃起了一段劇本。
He's good at ad-libbing his way out of trouble...
他善于為自己妙語解圍。