Double up(To). To fold together. “To double up the fist” is to fold the fingers together so as to make the hand into a fist. I doubled him up. I struck him in the wind, so as to make him double up with pain, or so as to leave him “all of a heap.” Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Double up from Fact Monster:
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