To spit on or cover with saliva; an archaic or vulgar term for spitting.
From be- + gob (from Middle English gobe, meaning 'mouth' or 'lump of something'). Related to 'gobble' and possibly Gaelic 'gob' meaning mouth.
The word 'gob' is still used in British English for 'mouth,' making 'begob' a rare fossil of how creatively English speakers once built vocabulary—you could add 'be-' to almost any body part word to create a crude but vivid action verb.
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