Thinking Cap Definition

noun
A state in which one thinks, especially carefully.
Put on one's thinking cap.
American Heritage

(humorous) A metaphor for a 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!
Wiktionary

Other Word Forms of Thinking Cap

Noun

Singular:
thinking cap
Plural:
thinking caps

Origin of Thinking Cap

  • From considering cap

    From Wiktionary

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thinking cap