quit vs knock off

quit and knock off both are verbs.

Word	Noun	Adjective	Verb	Adverb
quit	No	No	Yes	No
knock off	No	No	Yes	No

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

quit (verb)	knock off (verb)
give up in the face of defeat of lacking hope; admit defeat	stop pursuing or acting
go away or leave	get rid of (someone who may be a threat) by killing
turn away from; give up	write quickly
give up or retire from a position	take by theft
put an end to a state or an activity	cut the price of