ad-lib/ˌæd ˈlɪb/ verb (past tense and past participle ad-libbed, present participle ad-libbing) [date : 1900-2000; Origin : ad lib 'without any preparation' (19-21 centuries), from Modern Latin ad libitum 'according to desire'] [INTRANSITIVE AND TRANSITIVE] to say things that you have not prepared or planned when you are performing or giving a speech SYN improvise: ▪ I never use a script; I just ad lib the whole programme.
—ad-lib noun[COUNTABLE]
verb EXAMPLES FROM OTHER ENTRIES ▪ Betsy forgot her lines and had to ad-lib the rest of the scene. ▪ No one could remember the song very well, so we had to ad-lib. ▪ The other actors were thrown into confusion when she started ad-libbing her final speech.
ad-lib/ˌæd ˈlɪb/ verb (past tense and past participle ad-libbed, present participle ad-libbing)