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ad-lib

 
/ˈædˈlɪb/ v [I/T] (-bb-)

Definition

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

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