You searched for: “ad libs
Word Entries at Get Words: “ad libs
ad-lib (verb), ad-libs; ad-libbed; ad-libbing
To improvise all or part of a speech or another kind of performance; that is, to spontaneously say something without prior preparation: Many in the audience noticed that the mistress of ceremonies was ad-libbing her speech at the awards ceremony.
To  improvise words, gestures, etc. that are not in a script.
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This entry is located in the following unit: English Words in Action, Group A (page 3)
To spontaneously say something without prior preparation. (1)