extemporize
US /ɪkˈstem.pə.raɪz/
UK /ɪkˈstem.pə.raɪz/
1.
extemporiser, improviser
to compose, perform, or utter something without preparation; improvise
:
•
The jazz musician could extemporize a solo on the spot.
Le musicien de jazz pouvait improviser un solo sur-le-champ.
•
She had to extemporize a speech when the main speaker didn't show up.
Elle a dû improviser un discours lorsque l’orateur principal n’est pas venu.