hang on to your hat

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hang on to your hat

Also, hold your hat. An expression warning someone of a big surprise. For example, Hang on to your hat, we're about to go public, or Hold your hat-we just won the lottery. This expression may allude, according to lexicographer Eric Partridge, to a wild ride on a rollercoaster. [Colloquial; first half of 1900s]
See also: hang, hat, on
References in classic literature ?
Hold your hat over your wrists, if you don't want her to see the handcuffs.
Vote Labour and hold your hat for a sterling crisis.