"latch" in the noun sense
1. latch, door latch
spring-loaded doorlock that can only be opened from the outside with a key
2. latch
catch for fastening a door or gate a bar that can be lowered or slid into a groove
"latch" in the verb sense
1. latch
fasten with a latch
"latch the door"
Source: WordNet® (An amazing lexical database of English)
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