trim back vs trim down

trim back and trim down both are verbs.

Word	Noun	Adjective	Verb	Adverb
trim back	No	No	Yes	No
trim down	No	No	Yes	No

As verbs, trim back and trim down are synonyms defined as:

Other synonyms of trim back include bring down, cut, cut back, cut down, reduce, trim.

trim back (verb)	trim down (verb)
cut down on; make a reduction in	cut down on; make a reduction in