(third-person singular simple present doubles up, present participle doubling up, simple past and past participle doubled up)
- To double the quantity, amount or duration of something
- I'm going to double up my enlistment.
- (poker, by extension, intransitive) To double one's amount of chips by winning an all-in pot.
- To bend, bend over; to fold; to stoop.
- (intransitive) To have a secondary use.
- This unfolding sofa doubles up as a bed.
- (baseball) 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.
- (intransitive) To employ double the usual resources for a particular purpose.