gash (in/on something) a long deep cut in the surface of something, especially a person’s skin He needed an operation to close a nasty gash in his arm. The explosion left a wide gash in the rock. 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.Extra examples She got a nasty gash on the head. The accident left a deep gash in his leg. The bulldozers carved a great gash through the forest. The rocks tore a long gash in the ship’s hull. He had a nasty gash across his chest.