Definition of thinking cap
:a state or mood in which one thinks
—usually used in the phrase put one's thinking cap on
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thinking cap
noun
From the M-W Editors
First Known Use of thinking cap
1827
THINKING CAP Defined for English Language Learners
thinking cap
noun
Definition of thinking cap for English Language Learners
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—used to refer to the act of trying to solve a problem by thinking carefully about it
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