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pile on(to) (someone or something)
to make a heap of people on someone or something. The football players piled onto the poor guy holding the ball. They ran up to the ball carrier and piled on.
pile someone or something on(to) someone or somethingand pile someone or something on
to heap people or things onto someone or something. The wrestler piled the referee onto his unconscious opponent. We piled the kids on the heap of leaves we had raked up. Pile on the chili! What's a hot dog without chili?