get (one's) thinking cap on

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get (one's) thinking cap on

To begin thinking or considering very carefully and seriously (about something), often to solve a problem. OK, fellas, if we all get our thinking caps on, I'm sure we can come up with a way to earn enough money to go to the baseball game this weekend. A: "Well, boss, what do you think we should do?" B: "Just let me get my thinking cap on for a minute."
See also: cap, get, on, thinking