A snib is a manually operated catch for the internal locking of Yale type locks. Once operated it prevents key holders from using the lock externally, or allows the door to be closed without the lock engaging. Colloquial (UK) also the button inside car doors for locking the car. The term may also be used (as a noun) to indicate the bolt or latch on a door or window, or (as a verb) to refer to the act of bolting or locking something.

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