(transitive) To reduce slightly; to cut; especially, to remove excess. The adposition of can be used in the present perfect tense to designate the removed part.
(transitive) To decorate or adorn; especially of a Christmas tree.
(transitive, aviation, of an aircraft) To adjust pitch using trim tabs.
(transitive, nautical, of a vessel) To modify the angle relative to the water by shifting cargo or ballast; to adjust for sailing; to assume, or cause to assume a certain position, or trim, in the water.
(transitive, nautical, of a vessel's sails) To modify the angle (of the sails) relative to the wind, especially to set them at the most advantageous angle.
(dated) To balance; to fluctuate between parties, so as to appear to favour each.
(transitive) To make trim; to put in due order for any purpose; to make right, neat, or pleasing; to adjust.
(transitive, carpentry, of timber) To dress; to make smooth.