In valves:
* A type of tap, faucet or valve
* Steam cock, a drain valve on a steam engine cylinder
* Bibcock, a small type of valve
* Sample cock, a small valve fitted in breweries and other process industries to check the product during manufacture
* Stopcock, a valve used to restrict or isolate the flow of a liquid or gas through a pipe
* Petcock, a small valve, primarily for draining liquid or releasing pressure from a vessel
* Ballcock, a mechanism for filling water tanks
In clocks:
* A part of a clock or watch used to support an outrigger bearing for a gear or lever
* Balance cock, supports the balance wheel in a watch
* Fly cock, supports the fly on a bracket clock
* Back Cock, supports the pendulum and pallet arbor
In other:
* Cock, to prepare the hammer of a firearm for firing
* Shuttlecock, a high-drag projectile used in the sport of badminton
* Cock, the NATO reporting name of the Antonov An-22
* A Cocktail, a style of mixed drink
