To splash or dash with violence; to cause liquid to splash.
From be- (causative prefix) + gash. Gash originally meant a violent cut but developed meanings related to splitting or dashing. The be- prefix intensifies the action.
Old English used this kind of 'be-' verb for vivid, violent actions—'begash' creates the mental picture of water or blood violently splashing, much more evocative than simple 'splash.'
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