Definitions of lock:

• noun:   any wrestling hold in which some part of the opponent's body is twisted or pressured
• noun:   a fastener fitted to a door or drawer to keep it firmly closed
• noun:   a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key
• noun:   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
• noun:   a mechanism that detonates the charge of a gun
• noun:   a strand or cluster of hair
• verb:   pass by means through a lock in a waterway
• verb:   become rigid or immoveable

  Example: "The therapist noticed that the patient's knees tended to lock in this exercise"

• verb:   fasten with a lock

  Example: "Lock the bike to the fence"

• verb:   hold in a locking position

  Example: "He locked his hands around her neck"

• verb:   build locks in order to facilitate the navigation of vessels
• verb:   hold fast (in a certain state)

  Example: "He was locked in a laughing fit"

• verb:   become engaged or intermeshed with one another

  Example: "They were locked in embrace"

• verb:   place in a place where something cannot be removed or someone cannot escape

  Example: "The parents locked her daughter up for the weekend"

• verb:   keep engaged
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #4930)