lock

a fastener fitted to a door or drawer to keep it firmly closed

a strand or cluster of hair

a mechanism that detonates the charge of a gun

enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it

a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key

any wrestling hold in which some part of the opponent’s body is twisted or pressured

fasten with a lock; “lock the bike to the fence”

keep engaged; “engaged the gears”

become rigid or immoveable; “The therapist noticed that the patient’s knees tended to lock in this exercise”

hold in a locking position; “He locked his hands around her neck”

become engaged or intermeshed with one another; “They were locked in embrace”

hold fast (in a certain state); “He was locked in a laughing fit”

place in a place where something cannot be removed or someone cannot escape; “The parents locked her daughter up for the weekend”; “She locked her jewels in the safe”

pass by means through a lock in a waterway

build locks in order to facilitate the navigation of vessels