extemporize

US /ɪkˈstem.pə.raɪz/
UK /ɪkˈstem.pə.raɪz/
"extemporize" picture
1.

即興創作, 即興表演

to compose, perform, or utter something without preparation; improvise

:
The jazz musician could extemporize a solo on the spot.
這位爵士樂手可以當場即興創作一段獨奏。
She had to extemporize a speech when the main speaker didn't show up.
當主講人沒有出現時,她不得不即興發表一篇演講。