ad-lib verb Definition in British English Dictionary
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Definition of "ad-lib" - British English Dictionary

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ad-libverb [I or T]

uk   us   /ˌædˈlɪb/ (-bb-)
to speak in public without having planned what to say: She ad-libbed her way through the entire speech.
(Definition of ad-lib verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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