double up

Meanings

1. To double the quantity, amount or duration of something
2. To double one's amount of chips by winning an all-in pot.
3. To bend, bend over; to fold; to stoop.
4. To cause (someone) to bend over; to beat up (someone).
5. To have a secondary use.
6. 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
7. To employ double the usual resources for a particular purpose; to work in pairs.
8. To marry or live with someone; to share a living space.