Definition of extemporize in English:

extemporize

verb

[NO OBJECT]
  • Compose, perform, or produce something such as music or a speech without preparation; improvise.

    ‘he extemporized at the piano’
    [with object] ‘she was extemporizing touching melodies’
    improvise, ad lib, play it by ear, think on one's feet, cobble something together, throw something together, make it up as one goes along, take it as it comes
    busk it, wing it, do something off the cuff, do something off the top of one's head, do something on the spur of the moment
    View synonyms

Pronunciation:

extemporize

/ikˈstempəˌrīz/