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

[Tanyusha05]

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

[Mister Micawber]

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'.
_________________
Native English teacher at Mister Micawber's

[Chemical_Cake]

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.