| lock | (noun) any wrestling hold in which some part of the opponent's body is twisted or pressured | - |
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| (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 | Synonyms: ignition lock |
| (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 | Synonyms: lock chamber |
| (noun) a mechanism that detonates the charge of a gun | - |
| (noun) a strand or cluster of hair | - |
| lockage | (noun) passage through a lock in a canal or waterway | - |
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| (noun) a system of locks in a canal or waterway | - |
| (noun) a fee charged for passage through a lock in a canal or waterway | - |
| lockbox | (noun) a fireproof metal strongbox (usually in a bank) for storing valuables | Synonyms: deposit box, safe-deposit, safe-deposit box, safety-deposit, safety deposit box |
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| lockdown | (noun) the act of confining prisoners to their cells (usually to regain control during a riot) | - |
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| locker | (noun) a storage compartment for clothes and valuables; usually it has a lock | Synonyms: cabinet, storage locker |
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| (noun) a trunk for storing personal possessions; usually kept at the foot of a bed (as in a barracks) | Synonyms: footlocker |
| (noun) a fastener that locks or closes | - |
| locket | (noun) a small ornamental case; usually contains a picture or a lock of hair and is worn on a necklace | - |
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| locking | (noun) the act of locking something up to protect it | Synonyms: lockup |
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| lockjaw | (noun) an acute and serious infection of the central nervous system caused by bacterial infection of open wounds; spasms of the jaw and laryngeal muscles may occur during the late stages | Synonyms: tetanus |
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| lockkeeper | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockman, lockmaster |
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| lockman | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockkeeper, lockmaster |
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| lockmaster | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockkeeper, lockman |
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| locknut | (noun) supplementary nut that is screwed down on a primary nut to prevent it from loosening | Synonyms: safety nut |
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| lockout | (noun) a management action resisting employee's demands; employees are barred from entering the workplace until they agree to terms | - |
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| lockring | (noun) washer that prevents a nut from loosening | Synonyms: lock ring, lock washer |
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| locksmith | (noun) someone who makes or repairs locks | - |
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| lockstep | (noun) a manner of marching in file in which each person's leg moves with and behind the corresponding leg of the person ahead | - |
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| (noun) a standard procedure that is followed mindlessly | - |
| lockstitch | (noun) machine stitch in which the top thread interlocks with the bobbin thread | - |
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| lockup | (noun) the act of locking something up to protect it | Synonyms: locking |
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| (noun) jail in a local police station | - |