extemporise

• extemporize (mostly US)

• IPA^(key): /əkˈstɛmpəɹaɪz/

• Audio (US)

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• Audio (AU)

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extemporise (third-person singular simple present extemporises, present participle extemporising, simple past and past participle extemporised)

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

• extemporaneous
• extemporaneously
• extemporisation / extemporization

• off the cuff
• off the top of one's head
• play it by ear

• exposimeter