被某物弄倒可以用英文表示为"knocked down by something"。这个表达的来源可能源于人类在日常生活中会遇到被各种东西击倒的情况，例如被一阵大风吹倒或被一次强烈的撞击击倒。
下面是一些英文例句，并提供中文翻译供参考：
The wind knocked the tree down. (风把树吹倒了。)
The boxer was knocked down by a powerful punch. (拳击手被一次强力的拳击击倒了。)
She was knocked down by a car while crossing the street. (她在过马路时被一辆车撞倒了。)
下面是一些英文例句，并提供中文翻译供参考：
The wind knocked the tree down. (风把树吹倒了。)
The boxer was knocked down by a powerful punch. (拳击手被一次强力的拳击击倒了。)
She was knocked down by a car while crossing the street. (她在过马路时被一辆车撞倒了。)