Etymology
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gash (n.)

1540s, alteration of Middle English garce "a gash, cut, wound, incision" (early 13c.), from Old North French garser "to scarify, cut, slash" (Old French *garse), apparently from Vulgar Latin *charassare, from Greek kharassein "engrave, sharpen, carve, cut," from PIE *gher- (4) "to scrape, scratch" (see character). Loss of -r- is characteristic (see ass (n.2)). Slang use for "vulva" dates to mid-1700s. Provincial English has a set of words (gashly, gashful, etc.) with forms from gash but senses from gast- "dreadful, frightful."

gash (v.)

1560s, alteration of older garsh, from Middle English garsen (late 14c.), from Old North French garser "to cut, slash" (see gash (n.)). For loss of -r-, see ass (n.2). Related: Gashed; gashing.

updated on February 23, 2015

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Definitions of gash from WordNet
1
gash (n.)
a wound made by cutting;
Synonyms: cut / slash / slice
gash (n.)
a trench resembling a furrow that was made by erosion or excavation;
Synonyms: cut
gash (n.)
a strong sweeping cut made with a sharp instrument;
Synonyms: slash
2
gash (v.)
cut open;
Synonyms: slash
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.