The meaning of LOCK is a fastening (as for a door) operated by a key or a combination. How to use lock in a sentence.

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Lock definition: a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …

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If you don't lock your doors and windows, you'll be a sitting target for burglars. I'd only gone a few steps down the road when I realized I'd forgotten to lock the door.

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