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English definition of “ad-lib”

ad-lib

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