Meaning of “trim” - Learner’s Dictionary

trim

verb [ T ] uk us /trɪm/ (present participle trimming, past tense and past participle trimmed)
CUT (also trim off)

to cut a small amount from something to make it tidy or to remove parts that you do not need:

I've had my hair trimmed.
Trim the fat off the meat.
REDUCE

to reduce something:

to trim costs
be trimmed with sth

to be decorated with something around the edges:

a silk dress trimmed with lace

(Definition of “trim verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)