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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61. I couldn't find a key which fitted the lock.
62. The key has stuck in the lock.
63. If you shut the door it will lock automatically.
64. The key turns easily in the lock.
65. Don't forget to lock up before leaving home.
66. The lock has broken through constant use.
67. The criminals are now safely under lock and key.
68. Water went rushing through the lock gates.
69. I'll leave you to lock up.
70. Don't forget to lock up the warehouse.
71. The key turned stiffly in the lock.
72. John brushed a lock of hair from his eyes.
73. She brushed a lock of hair off his forehead.
74. Can whoever leaves last please lock up?
75. Firemen had to smash the lock to get in.
75. Wish you can benefit from our online sentence dictionary and make progress every day!
76. I had the steering wheel on full lock .
77. Leave your car here and lock it up.
78. It's not my job to lock up!
79. Oh, and don't forget to lock the back door.
80. Don't forget to lock up at night.
81. She fitted her key in the lock.
82. I was terrified they would lock me up again.
83. There's something jamming the lock.
84. Don't neglect to lock the door when you leave.
85. I can't get this drawer to lock.
86. The key sticks in the lock.
87. It's my responsibility to lock the doors.
88. We keep our valuables under lock and key.
89. Lock the door when you leave.
90. The key stuck in the lock.