knock up vs bang up

knock up and bang up both are verbs.

Word	Noun	Adjective	Verb	Adverb
knock up	No	No	Yes	No
bang up	No	No	Yes	No

As verbs, knock up and bang up are synonyms defined as:

Other synonyms of knock up include impregnate, prang up.

knock up (verb)	bang up (verb)
make pregnant	make pregnant
	damage or destroy as if by violence