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Something used for fastening, which can only be opened with a key or combination.
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(by extension) A mutex or other token restricting access to a resource.
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A segment of a canal or other waterway enclosed by gates, used for raising and lowering boats between levels.
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The firing mechanism.
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Complete control over a situation.
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Something sure to be a success.
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A player in the scrum behind the front row, usually the tallest members of the team.
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A fastening together or interlacing; a closing of one thing upon another; a state of being fixed or immovable.
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A place from which egress is prevented, as by a lock.
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A device for keeping a wheel from turning.
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A grapple in wrestling.