if a building is falling down, it is in very bad condition
if something such as an argument or system falls down, it fails because a particular part of it is weak or not correct
if something you are wearing is falling down, it is slipping down your legs
same as fall
to do a particular job or activity in a careless way so that you are not successful
But soon they began to fall down into the darkness, and as the sun turned west a grey shadow crept over their faces.
I fell down and hurt my knee.
Instead of releasing his foot as he sat on the sand, he tried to stand only to fall down again.
Their argument falls down on several important points.
When she stood up she felt shaky and thought she would fall down.
falls down
falling down
fell down
fallen down
There is no origin for this phrasal verb
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