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latch (v.)

Old English læccan "to grasp or seize, catch hold of," also "comprehend," from Proto-Germanic *lakkijanan. Not found in other Germanic languages; according to Watkins probably from PIE *(s)lagw- "to seize" (see lemma). In its original sense the verb was paralleled and then replaced by French import catch (v.). Meaning "to fasten with a latch" is mid-15c. Related: Latched; latching.

latch (n.)

"device for catching and retaining," especially "a fastening for a door," late 13c., probably from latch (v.).

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Definitions of latch from WordNet
1
latch (n.)
spring-loaded doorlock that can only be opened from the outside with a key;
Synonyms: door latch
latch (n.)
catch for fastening a door or gate; a bar that can be lowered or slid into a groove;
2
latch (v.)
fasten with a latch;
latch the door
From wordnet.princeton.edu