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to say something in a speech or a performance that you have not prepared or practised 即席讲话；即兴表演 She abandoned her script and began ad-libbing. 她抛开脚本即兴表演起来。 🔊🔊 - ad-lib something
I lost my notes and had to ad-lib the whole speech. 我把讲稿弄丢了，只好临时说了一通。 🔊🔊 He ad-libbed his way through the meeting. 在会议期间，他随心所欲。
Word Originearly 19th cent. (as an adverb): abbreviation of ad libitum.