extemporize

verb

(intransitive) To perform or speak without prior planning or thought; to act in an impromptu manner; to improvise.

She had to extemporize a speech when the teleprompter malfunctioned.

意味（1）

(intransitive) To perform or speak without prior planning or thought; to act in an impromptu manner; to improvise.

"Will you please tell me whose music you have been playing?" . . .

"It's nobody's, miss."

"Do you mean you have been extemporizing all this time?"

意味（2）

(transitive) To adapt, improvise, or devise action or speech in an impromptu or spontaneous manner.