Meaning

• Something used for fastening, which can only be opened with a key or combination.

• (by extension) A mutex or other token restricting access to a resource.

• A segment of a canal or other waterway enclosed by gates, used for raising and lowering boats between levels.

• The firing mechanism.

• Complete control over a situation.

• Something sure to be a success.

• A player in the scrum behind the front row, usually the tallest members of the team.

• A fastening together or interlacing; a closing of one thing upon another; a state of being fixed or immovable.

• A place from which egress is prevented, as by a lock.

• A device for keeping a wheel from turning.

• A grapple in wrestling.

Meaning

• To become fastened in place.

  "If you put the brakes on too hard, the wheels will lock."

• To fasten with a lock.

  "Remember to lock the door when you leave."

• To be capable of becoming fastened in place.

  "This door locks with a key."

• To intertwine or dovetail.

  "We locked arms and stepped out into the night."

• (break dancing) To freeze one's body or a part thereof in place.

  "a pop and lock routine"

• To furnish (a canal) with locks.

• To raise or lower (a boat) in a lock.

• To seize (e.g. the sword arm of an antagonist) by turning the left arm around it, to disarm him.

• To modify (a thread) so that users cannot make new posts in it.

• (WMF jargon) To prevent a page from being edited by other users.

  "Frequently vandalized pages are generally locked to prevent further damage."