ad-lib - definition and synonyms

verb [intransitive/transitive] 

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/ˌæd ˈlɪb/
present tense
present participlead-libbing
past tensead-libbed
past participlead-libbed
  1. to say something in a speech, play etc without preparing or writing it before you say it

    I lost the notes for my talk and had to ad-lib.

     Synonyms and related words