Synonyms of 'play it by ear'
▷ See ear
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If you ad-lib something in a play or a speech, you say something which has not been planned or written beforehand.
He is rather disjointed when he ad-libs.
When performers improvise, they invent music or words as they play, sing, or speak.
Take the story and improvise on it.
Thesaurus for play it by ear from the Collins English Thesaurus
to act as the situation demands , without a preconceived plan; improvise