- a state of mind marked by reflection or concentration: If we put on our thinking caps, we may come up with the answer.
Origin of thinking cap
Examples from the Web for thinking cap
Historical Examples of thinking cap
Now here's my idea that I evolved with my thinking-cap—I mean night-cap—on!Glory and the Other Girl
Annie Hamilton Donnell
"And this head of mine would have to put on its thinking-cap," he pursued jovially.The Leavenworth Case
Anna Katherine Green
We are a little too inclined to doff the thinking-cap at the first opportunity.The Secrets of a Savoyard
Henry A. Lytton
But I had my New England "thinking-cap" firmly set on my shoulders.Geraldine Farrar
Tell me what you know and then my 'thinking-cap' may be put on to some advantage.Kitty's Conquest
see put on one's thinking cap.