do in vs knock off

do in and knock off both are verbs.

Word	Noun	Adjective	Verb	Adverb
do in	No	No	Yes	No
knock off	No	No	Yes	No

As verbs, do in and knock off are synonyms defined as:

do in and knock off: get rid of (someone who may be a threat) by killing

Other synonyms of do in include liquidate, neutralise, neutralize, waste.

do in (verb)	knock off (verb)
get rid of (someone who may be a threat) by killing	stop pursuing or acting
	get rid of (someone who may be a threat) by killing
	write quickly
	take by theft
	cut the price of