Verb

1. to reduce slightly; to cut; especially, to remove excess; e.g. 'trim a hedge', 'trim a beard'.

   Place the screen material in the frame, secure it in place, and trim the edges.

   The company trimmed jobs for the second time this year.

2. to decorate or adorn; especially, to decorate a Christmas tree

   They traditionally trim the tree on Christmas Eve.

3. To modify the angle of a vessel to the water by shifting cargo or ballast; to adjust for sailing; to assume, or cause a vessel to assume, a certain position, or trim, in the water. (FM 55-501).
   • 1883: Robert Louis Stevenson, Treasure Island

     The captain made us trim the boat, and we got her to lie a little more evenly.

4. To modify the angle of a vessel's sails relative to the wind, especially to set the sails to the most advantageous angle.

Noun

1. decoration; especially, decoration placed along edges or borders

   Paint the house white with blue trim.

2. a haircut, especially a moderate one to touch up an existing style

   I went to the hairdresser for a trim and came back nearly bald.

3. the manner in which something is equipped or adorned; especially, of a car

   The car comes in three different trims.

4. engaging in sexual intercourse
5. The fore-and-aft angle of the vessel to the water, with reference to the cargo and ballast; the manner in which a vessel floats on the water, whether on an even keel or down by the head or stern
6. The arrangement of the sails with reference to the wind.

Adjective

1. physically fit

   He goes jogging every day to keep trim.

2. slender, lean; as a trim figure
3. neat or smart in appearance; as a trim lawn

Adverb

1. In good order, properly managed or maintained.
2. With sails well trimmed.