put (one's) thinking cap on(redirected from puts her thinking cap on)
put (one's) thinking cap on
To begin thinking very hard about something, especially a solution to a problem. If we all put 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 put my thinking cap on for a minute."