put on one's thinking cap

idiom

Definition of put on one's thinking cap

informal
: to start trying to think of what should be done

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“Put on one's thinking cap.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/put%20on%20one%27s%20thinking%20cap. Accessed 15 Aug. 2020.

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