knock off vs bring down

knock off and bring down both are verbs.

Word	Noun	Adjective	Verb	Adverb
knock off	No	No	Yes	No
bring down	No	No	Yes	No

As verbs, bring down is a hypernym of knock off; that is, bring down is a word with a broader meaning than knock off:

Other hypernyms of knock off include cut, cut back, cut down, reduce, trim, trim back, trim down.

knock off (verb)	bring down (verb)
stop pursuing or acting	cut down on; make a reduction in
get rid of (someone who may be a threat) by killing	impose something unpleasant
write quickly	cause to be enthusiastic
take by theft	cause to come to the ground
cut the price of	move something or somebody to a lower position
	cause the downfall of; of rulers