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Definition of ad lib verb from the Oxford Advanced American Dictionary

 

ad lib

 verb
verb
NAmE//ˌæd ˈlɪb//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they ad lib he / she / it ad libs past simple ad libbed -ing form ad libbing
 
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to say something in a speech or a performance that you have not prepared or practiced synonym improvise She abandoned her script and began ad libbing. ad lib something I lost my notes and had to ad lib the whole speech. He ad libbed his way through the meeting.
The speech was full of ad libs.
ad lib adjective
 
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an ad lib speech
ad lib adverb
 
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She delivered her lines ad lib.