Definition of "double up" [double up]

• To double the quantity, amount or duration of something (verb)
• To double one's amount of chips by winning an all-in pot. (verb)
• To bend, bend over; to fold; to stoop. (verb)
• To have a secondary use. (verb)
• To get the second out in a double play, typically referring to getting an out by beating a runner back to a base (often by throwing) after a fly ball has been caught (verb)

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• "Torbert attacked with such vigor as at first to double up the head of Breckenridge's corps and throw it into confusion, but when the Confederates realized that they were confronted only by cavalry, Early brought up the whole of the four infantry divisions engaged in his manoeuvre, and in a sharp attack pushed Torbert rapidly back."
• "Change Handlers if Sso-ngii can't hold on — double up if you have to — but keep Sleipnir here."