Knock down with cards (4)
I believe the answer is:
deck
I believe this is a triple definition!
'knock' is the first definition.
(thesaurus)
'down' is the second definition.
(thesaurus)
'with' is a link.
'cards' is the third definition.
(deck of cards)
(Other definitions for deck that I've seen before include "Pack - floor in boat" , "Set of cards" , "Adorn; card pack" , "part of ship" , "Pack - part of record player" .)