Synonym: clasp, close, fasten, hook, latch, seal, shut. Antonym: unlock. Similar words: block, o'clock, local, locate, location, dock, sock, shock. Meaning: [lɑk /lɒk] 
n. 1. a fastener fitted to a door or drawer to keep it firmly closed 2. a strand or cluster of hair 3. a mechanism that detonates the charge of a gun 4. 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 5. a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key 6. any wrestling hold in which some part of the opponent's body is twisted or pressured. v. 1. fasten with a lock 2. keep engaged 3. become rigid or immoveable 4. hold in a locking position 5. become engaged or intermeshed with one another 6. hold fast (in a certain state) 7. place in a place where something cannot be removed or someone cannot escape 8. pass by means through a lock in a waterway 9. build locks in order to facilitate the navigation of vessels.
n. 1. a fastener fitted to a door or drawer to keep it firmly closed 2. a strand or cluster of hair 3. a mechanism that detonates the charge of a gun 4. 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 5. a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key 6. any wrestling hold in which some part of the opponent's body is twisted or pressured. v. 1. fasten with a lock 2. keep engaged 3. become rigid or immoveable 4. hold in a locking position 5. become engaged or intermeshed with one another 6. hold fast (in a certain state) 7. place in a place where something cannot be removed or someone cannot escape 8. pass by means through a lock in a waterway 9. build locks in order to facilitate the navigation of vessels. 
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91. She rammed the key into the lock.
92. Did you lock the boot?
93. She kept a lock of her mother's hair.
94. He jammed his key into the lock.
95. Lock the door to ensure us from interruption.
96. Don't neglect to lock the door.
97. I hope they lock him away for years.
98. The key is jammed in the lock.
99. In his panic, he began scrabbling at the lock.
100. Dad keeps all his liquor under lock and key.
101. He sold the business lock, stock and barrel.
102. He turned the lock and pushed the door open.
103. Sandra, will you lock up tonight when you go?
104. Can you unfasten the lock catch of a box?
105. She keeps a lock of his hair.
106. As you are leaving last,(Sentencedict.com) lock up.
107. Be sure to lock your bicycle.
108. Lock the door on your way out.
109. This lock is damaged.This door will never open!
110. Lock the cat in the kitchen.
111. She's a lock for promotion this year.
112. Don't forget to lock the door.
113. I'll lock the doors and chain you up.
114. I lock the door as a matter of course.
115. She jiggled with the lock.
116. Don't forget to lock the garage door.
117. A lock was screwed on the drawer.
118. He slipped the lock, and the door opened.
119. Make sure you lock the door behind you when you go out.
120. An extra lock on the door is an added insurance against burglars.