thinking cap

n. A state in which one thinks, especially carefully: put on one's thinking cap.

think′ing cap`

n. a state of mind marked by concentration: We'll need our thinking caps to solve this one. [1870–75]

Thesaurus

Noun

thinking cap - a state in which one thinks frame of mind, state of mind - a temporary psychological state

IdiomsSeeput on one's thinking cap

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