have (one's) thinking cap on

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have (one's) thinking cap on

To be using, or be ready to use, the utmost of one's intellectual abilities; to be able or ready to think very carefully and seriously (about something), often to solve a problem. I'm really excited for the pub quiz tonight! Does everyone have their thinking caps on? OK fellas, if we all have our thinking caps on, I'm sure we can come up with a way to earn enough money to go to the baseball game this weekend.
See also: cap, have, on, thinking
References in classic literature ?
The king of Great Britain, on his part, has an absolute negative upon the acts of the two houses of Parliament.
All the members of the judiciary department are appointed by him, can be removed by him on the address of the two Houses of Parliament, and form, when he pleases to consult them, one of his constitutional councils.
It would overtop the Houses of Parliament, and even the Great Pyramid of Egypt.
Woolwich is safe, and the Houses of Parliament and Whitehall.
The sun was just setting, and the Clock Tower and the Houses of Parliament rose against one of the most peaceful skies it is possible to imagine, a sky of gold, barred with long trans- verse stripes of reddish-purple cloud.
After spending a week in Cape Town, finding that they overcharged me at the hotel, and having seen everything there was to see, including the botanical gardens, which seem to me likely to confer a great benefit on the country, and the new Houses of Parliament, which I expect will do nothing of the sort, I determined to go back to Natal by the /Dunkeld/, then lying at the docks waiting for the /Edinburgh Castle/ due in from England.
When he reached the Abbey, he turned back and crossed Westminster Bridge and sat down to watch the trails of smoke behind the Houses of Parliament catch fire with the sunset.
He walked on complacently as far as the Houses of Parliament.
There was a cloud of dense smoke somewhere near the Houses of Parliament, but it was impossible from where we were to see what was on fire.
It is true that the debates of both Houses of Parliament the whole session through, uniformly tended to the protracted deliberation, How not to do it.
What a miracle the masculine conception of life is--judges, civil servants, army, navy, Houses of Parliament, lord mayors--what a world we've made of it
A crime of mysterious character was committed last night at 16 Godolphin Street, one of the old-fashioned and secluded rows of eighteenth century houses which lie between the river and the Abbey, almost in the shadow of the great Tower of the Houses of Parliament.
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