To bend, bend over; to fold; to stoop.
To employ double the usual resources for a particular purpose.
To double one's amount of chips by winning an all-in pot.
To have a secondary use.
To double the quantity, amount or duration of something
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
To twist; turn
To wrench; strain
A painful muscular spasm in the neck or back