thinking cap

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From considering cap[1]


thinking cap (plural thinking caps)

  1. (humorous) A supposed piece of headgear worn while one is thinking about how to solve a problem.
    This project looks like it will be a real challenge - put your thinking cap on!


  1. ^ 1605 Robert Armin, Foole upon Foole (later A Nest of Ninnies), "The Cobler puts off his considering cap, why sir, sayes he, I sent them home but now."