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extemporize

verb

/ɪkˈstɛmpəraɪz/

Meaning

To speak or perform without preparation; improvise.

The actor had to extemporize when he forgot his lines.

improvise, ad-lib, invent, make up

rehearse, plan, prepare

extemporize a speech, extemporize on stage, extemporize remarks

To gather or bring together items from different places.

To make false and damaging statements about someone; to slander.

to make something known; to reveal information that was previously secret or hidden

To make someone unhappy, worried, or angry.

to form crystals; to make an idea or plan clear and definite

to suggest or assume that something is true as the basis for reasoning or discussion