latch

Noun
  1. Spring-loaded doorlock that can only be opened from the outside with a key (synset 103650325)
  2. Catch for fastening a door or gate;
    A bar that can be lowered or slid into a groove (synset 103650172)
Verb
  1. Fasten with a latch (synset 201289380)
    "latch the door"

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