(Usually) one of a pair of gates at each end of a lock chamber on a canal, or river with a weir.

(computing theory) The undesirable situation where multiple threads of equal priority contend repeatedly for the same lock.

plural of lock convoy

(mechanical engineering) A problem mostly affecting gasoline-fueled internal combustion engines, where the liquid fuel changes state from liquid to gas while still in the fuel delivery system, reducing the pump pressure and causing transient power loss or complete stalling.

plural of Bramah lock

(historical) A kind of high-security axial wafer lock.

(slang) A state of extreme lethargy induced by marijuana.

plural of line lock

(automotive) A device that allows the front brakes to lock independently of the rear brakes via a switch.

plural of air lock