to play it by ear
Submitted by Guus on Fri, 06/15/2007 - 10:54am
If you play it by ear, you don’t have a plan of action, but decide what to do as events take shape.
http://www.usingenglish.com/reference/idioms/play+it+by+ear.html
Where I found or heard this:
Conversation at work

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