Bill(fell down)some steps but fortunately he didn't hurt himself badly.请问这里的fall down是一个词组吗?怎么理解呢?有相关例句最好了

fall down 摔倒的意思
fall down强调的是“滑倒、倒下”，后接宾语时应加上介词from。

(再某方面)失败

fall down fall down 落下；跌到；倒塌；失败；证明是不行的

倒塌; 跌倒
Many buildings fell down during the earthquake.
在地震中许多楼房倒塌了。
失败
His plans have fallen down.
他的计划失败了。

fall down 倒下，跌倒，掉落，跪倒，失败
I fell down before him 我跪倒在他面前
his plans have fallen down.他的计划失败了

fall down 倒下,摔倒
Several trees fell down in the gales.
好几颗数载那场风暴中倒下了
The boy hit the tree to hard that he fell down.
男孩重重地撞在树上,结果自己倒下了.
If people run across the road,they may fall down.
如果人们跑过马路的话,他们可能会摔倒.
还有一个意思,失败.
本题是第一个意思