/ gæʃ; NAmE / noun , verb
■ noun
gash (in / on sth) a long deep cut in the surface of sth, especially a person's skin
■ verb
[ vn ] to make a long deep cut in sth, especially a person's skin :
He gashed his hand on a sharp piece of rock.
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WORD ORIGIN
Middle English garse , from Old French garcer to chap, crack, perhaps based on Greek kharassein sharpen, scratch, engrave. The current spelling is recorded from the mid 16th cent.