get played like a fiddle
To be skillfully manipulated by someone to suit their own needs, ends, or benefits. I got played like a fiddle by that travelling salesman. Now what am I going to do with all this junk that he convinced me to buy? Can't you see that his flattery is totally insincere? You're getting played like a fiddle! Mom, why did you give this guy money? I'm sorry, but I think you got played like a fiddle.
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