knock off vs trim back

knock off and trim back both are verbs.

Word	Noun	Adjective	Verb	Adverb
knock off	No	No	Yes	No
trim back	No	No	Yes	No

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

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

knock off (verb)	trim back (verb)
stop pursuing or acting	cut down on; make a reduction in
get rid of (someone who may be a threat) by killing
write quickly
take by theft
cut the price of