Where does the expression “to keep under one’s hat” come from and What does it mean?

One would suppose that this warning would be as old as the first hat, but its actual history appears to have been no earlier than the closing years of the nineteenth century.

What is kept under the hat, of course, is retained within the head; that is, it remains a secret.

About Karen Hill

Karen Hill is a freelance writer, editor, and columnist. Born in New York, her work has appeared in the Examiner, Yahoo News, Buzzfeed, among others.

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