put on one's thinking cap
Think or reflect seriously, as in A new slogan? I'll have to put on my thinking cap for that. This term originated in the late 1800s and replaced considering cap, which dates from the early 1600s.
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How to use put on one's thinking cap in a sentence
To put it rather uncharitably, the USPHS practiced a major dental experiment on a city full of unconsenting subjects.
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
Just the hard-on before you shoot unarmed members of the public.'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.Expressive Voice Culture|Jessie Eldridge Southwick
He alludes to it as one of their evil customs and used by them to produce insensibility.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.Ramona|Helen Hunt Jackson
He was voluble in his declarations that they would “put the screws” to Ollie on the charge of perjury.The Bondboy|George W. (George Washington) Ogden
Truth is a torch, but one of enormous size; so that we slink past it in rather a blinking fashion for fear it should burn us.Pearls of Thought|Maturin M. Ballou