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- put thinking cap on
put thinking cap on
put one's thinking cap on
Fig. to start thinking in a serious manner. (Usually used with children.) It's time to put our thinking caps on, children. All right now, let's put on our thinking caps and do some arithmetic.
put your thinking cap on
to start to think seriously about how to solve a problem Let me put my thinking cap on and see if I can come up with an answer.