Definition of trims:
(v) :
(transitive) To reduce slightly; to cut; especially, to remove excess.
(v) :
(transitive) To decorate or adorn; especially of a Christmas tree.
(v) :
(transitive, aviation, of an aircraft) To adjust the positions of control surfaces, sometimes using trim tabs, so as to modify or eliminate the aircraft's tendency to pitch, roll, or yaw when the cockpit controls are released.
(v) :
(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.
(v) :
(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.
(v) :
(dated) To balance; to fluctuate between parties, so as to appear to favour each.