S Dollar Toppled by Tumbling Home Prices 'Toppled' here means 'knocked down', 'made to fall down'. (by the falling prices) 'Tumbling' here means falling in a rapid, erratic manner. How do the words differ from each other?
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As I understand it, the subject is doing the toppling to something else. E.g. When something topples something else, it knocks it down. When something tumbles, it's happening to the object. It is tumbling - falling erratically.