double up

verb8

1. •
   To bend, bend over; to fold; to stoop.

   • 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 […] — 1970
2. •
   To cause (someone) to bend over; to beat up (someone).

   • I doubled him up with a swift punch to the stomach.
3. •
   To double the quantity, amount or duration of something

   • I'm going to double up my enlistment.
4. •
   To double one's amount of chips by winning an all-in pot.
5. •
   To have a secondary use.

   • This unfolding sofa doubles up as a bed.
6. •
   (slang) To marry or live with someone; to share a living space.
7. •
   To employ double the usual resources for a particular purpose; to work in pairs.
8. •
   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

   • Jones snared the liner and then stepped on the bag to double up the runner.