tumble
verb [ I ] uk/ˈtʌm.bəl/ us/ˈtʌm.bəl/
跌倒;滚下，坠落;倒塌
to fall quickly and without control
I lost my footing and tumbled down the stairs. 我一失足从楼梯上滚了下来。
At any moment the whole building could tumble down. 整幢建筑随时有可能坍塌。
He lost his balance and tumbled over. 他失去平衡摔倒了。
（价值）暴跌，骤降
to fall a lot in value in a short time
Share prices tumbled yesterday. 昨天股票大跌。
跌跌撞撞地走
to move in an uncontrolled way, as if falling or likely to fall
An excited group of children tumbled out of school/the bus. 一群激动不已的孩子一窝蜂地跑出了学校／跑下了公共汽车。
Phrasal verb
tumble to something 突然明白，对…恍然大悟
to suddenly understand something
I think he's tumbled to our plan. 我觉得他已茅塞顿开，明白了我们的计划。
tumble
noun [ C ] uk/ˈtʌm.bəl/ us/ˈtʌm.bəl/
摔倒，跌跤;跌落
a sudden fall
She took a nasty tumble on her way to work and grazed her arm. 她上班途中重重摔了一跤，擦伤了胳膊。
Idiom
take a tumbleidiom 急剧下降
to fall suddenly to a lower level
Company profits took a tumble last year. 去年公司利润急剧下降。