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Things fall over; people DO NOT fall over (unless they're already dead).
Ex: During the earthquake, all the bookcases fell over. | The children ran and jumped so roughly in the living room that one of the lamps fell over.
Ex: The teacher stumbled on some books that had been left near the door and fell down. | In some climates you have to be very careful in the winter. You could slip on a patch of ice and fall down.
A palavra tombar, pelo menos pra mim, pode ser usado para pessoas. Por esse motivo não poderia ser usado como tradução de fall over