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English definition of “ad-lib”

ad-lib

verb [I/T]    /ˈædˈlɪb/ (-bb-)
to do something without preparation or planning: [I] She had lost her notes, so she ad-libbed for ten minutes. ad-lib    /ˈædˈlɪb/ adjective, adverb I did not want to give an ad-lib speech.
(Definition of ad-lib verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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