Definition of extemporize in English:
extemporize
(British extemporise)
verb ɛkˈstɛmpərʌɪzɪkˈstɛmpərʌɪzɪkˈstɛmpəˌraɪz
[no object]Compose or perform something such as music or a speech without preparation; improvise.
he extemporized at the piano
with object she was extemporizing touching melodies
Synonyms
improvise, ad lib, play it by ear, think on one's feet, throw/cobble something together, make it up as one goes along, take it as it comes
informal 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
Definition of extemporize in US English:
extemporize
(British extemporise)
verbɪkˈstɛmpəˌraɪzikˈstempəˌrīz
[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
Synonyms
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