(transitive) To double the quantity, amount or duration of something.
I'm going to double up my enlistment.
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(poker, by extension, intransitive) To double one's amount of chips by winning an all-in pot.
If I could jump high enough out of the water to wedge my doubled-up fist in that crack I could hang by it. If I opened my hand I'd slide right back in the water, but if I could keep my fist closed
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(intransitive, of a person) To bend, bend over; to fold; to stoop.
I doubled him up with a swift punch to the stomach.
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