put on one's thinking cap, to

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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.
See also: cap, on, put, thinking
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

put on one's thinking cap, to

To take time to reflect or ponder. This term, which at first was stated as one’s considering cap, dates from the early seventeenth century. “Now I’ll put on my considering cap,” wrote John Fletcher in his play The Loyal Subject (1618). It only became a thinking cap in the late nineteenth century.
See also: on, put, thinking
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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