What does "let's play it by ear" mean?

Hi everybody! How is your English improving?
Please, anybody explain me what does idiom “let’s play it by ear” mean?
Thank you very much in advance!

Best regards, Tatyana

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Do something without planning or on an ad hoc basis, dependent on the circumstances. Another casual idiom with the same meaning is ‘to wing it’.

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The origin of this phrase is the world of music; its literal meaning is to play an instrument without reference to sheet music, and it is still used in this sense.