doubling up

present participle and gerund of double up

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