ad lib

ad lib  verb
[intransitive and transitive]to say things that you have not prepared or planned when you are performing or giving a speech:
  • I never use a script; I just ad lib the whole programme.
—ad-lib noun [countable]
© 2011 . Team work : Tamil Students Association - University of Illinois - Chicago / Special Thanks To: OXFORD DICTIONARY, Cambridge Advanced Learner's Dictionary and Tamil Dictionaries