From The Collaborative International Dictionary of English v.0.44 [gcide]:
Lock \Lock\, verb (used with an object) [imp. & p. p. {Locked}; p. pr. & vb. n. {Locking}.]
1. To fasten with a lock, or as with a lock; to make fast; to prevent free movement of; as, to lock a door, a carriage wheel, a river, etc.
2. To prevent ingress or access to, or exit from, by fastening the lock or locks of; -- often with up; as, to lock or lock up, a house, jail, room, trunk. etc.
3. To fasten in or out, or to make secure by means of, or as with, locks; to confine, or to shut in or out -- often with up; as, to lock one's self in a room; to lock up the prisoners; to lock up one's silver; to lock intruders out of the house; to lock money into a vault; to lock a child in one's arms; to lock a secret in one's breast.
4. To link together; to clasp closely; as, to lock arms. '' Lock hand in hand.'' --Shak.
5. (Canals) To furnish with locks; also, to raise or lower (a boat) in a lock.
6. (Fencing) To seize, as the sword arm of an antagonist, by turning the left arm around it, to disarm him.
From WordNet (r) 2.0 [wn]:
noun
1: the act of locking something up to protect it [syn: {lockup}]
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