Bring (or fall) down (6)
I believe the answer is:
topple
I believe this is a double definition.
'bring' is the first definition.
(thesaurus)
'fall down' is the second definition.
(thesaurus)
(Other definitions for topple that I've seen before include "dethroned" , "(Cause to) tip over" , "Overbalance and fall headlong" , "Fall, tumble" , "Knock (from power?)" .)