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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211. And talking of supporters, you'd better lock your barrow.
212. Don't forget to lock up.
213. Lock, 29, said his lawyers had advised him not to comment on the case.
214. It is one of the blessings of nature that the lock is something which needs minor attention.
215. Before going ashore, secure hatches and lock all portholes and doors.
216. Gripping a hand rail, she waited for the door of the air lock to open.
217. For other developers there's an application programming interface that gives access to the lock manager.
218. Lock forward Bayfield had to leave the pitch while playing for Northampton after suffering an asthma attack.
219. Behind them, though, was a heavy steel lock which prevented any further advance.
220. Apart from your loss of property, you then have the added problem of changing every lock in the house.
221. Make backup copies of your data, and lock them away.
222. The four of us meet outside the apartment and watch Glendenning lock the door.
223. The ones on the outer door I can understand,(sentencedict.com/lock.html) but why lock up the bathroom?
224. But they have more to lose: their traditional dominance of the field, their lock on the very notion of athleticism.
225. They had just negotiated a lock and it had been her turn to go ashore.
226. Through the air lock she went, down the metal steps, and out on to the Moon's dusty surface.
227. Finally, they were let through an air lock guarded by massive metal doors into the reactor structure.
228. Back up your data. Make backup copies of your data, and lock them away.
229. If you have quick release wheels, take off the front wheel and lock it to the frame and back wheel.
230. When lock is achieved, the digital detector is switched out of circuit to avoid noise denigration in the analogue circuit.
231. Some police agencies lock anklets on criminal suspects, convicts and parolees that set off an alarm if the person leaves home.
232. In order to lock into today's low rates potential borrowers will have to agree to marginally higher rates than are really current.
233. The engram itself, upon which the lock depended, may not be accessible without a full Dianetic address to the problem.
234. Always lock your garage.
235. Deliberate and unhurried, he tried them one after another in the lock under the white, nineteenth-century china handle.