I lost my footing and tumbled down the stairs.
我一失足從樓梯上滾了下來。
At any moment the whole building could tumble down.
整幢建築隨時有可能倒塌。
He lost his balance and tumbled over.
他失去平衡摔倒了。
Share prices tumbled yesterday.
昨天股票大跌。
An excited group of children tumbled out of school/the bus.
一群激動不已的孩子一窩蜂地跑出了學校/跑下了公車。