To avoid work or responsibility by making excuses, or to hit with a heavy object (primarily Australian/British slang).
Australian slang, possibly derived from 'budge' or from the noun 'bludgeon.' The exact origin is unclear but became common in Australian English by the late 19th century.
In Australia, 'bludge' is the perfect word for someone who pretends to work while actually doing nothing—it's so common that Australian employees have turned avoiding work into an art form with this vocabulary!
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