bring down vs knock off

bring down and knock off both are verbs.

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

As verbs, knock off is a hyponym of bring down; that is, knock off is a word with a more specific, narrower meaning than bring down:

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