extemporize
Verb
Meaning
To speak extempore; especially, to discourse without special preparation; to make an offhand address.
To do, make, or utter extempore or off-hand; to prepare in great haste, under urgent necessity, or with scanty or unsuitable materials; as, to extemporize a dinner, a costume, etc.
Source: Webster's dictionarySynonyms
improvise
devise
extemporise
improvize
play
fake
improvised
invent
jamming
concoct
contrive
brainstorm
mock up
ad lib
throw together
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Examples
he extemporized a speech at the wedding
after the hurricane destroyed our house, we had to improvise for weeks