extemporise

verb ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about extemporise at Wordnik → Where our words come from →

1. To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.
2. To do something in a makeshift way.
3. To make or create ex tempore.