Definition of "extemporise" [extemporise]

• To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise. (verb)
• To do something in a makeshift way. (verb)
• To make or create extempore. (verb)
• (music) To compose extemporaneously or improvise. (verb)

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• "Žižek, though, regards the idea of a central thesis in much the same way that the great jazz saxophonist John Coltrane regarded a melody – as something to riff off, extemporise on, and return to only when all associated sub-themes have been exhausted."
• "As so often in our institutional history, the right answer was to extemporise judiciously."
• "Now when I heard this, O Commander of the Faithful, great concern get hold of me and I was beyond measure troubled, and behold, I heard a Voice from behind me extemporise these couplets,"