Possible Definitions:
1. Sketch (n.) An outline or general delineation of anything; a first rough or incomplete draught or plan of any design; especially, in the fine arts, such a representation of an object or scene as serves the artist's purpose by recording its chief features; also, a preliminary study for an original work.
2. Sketch (n.) To draw the outline or chief features of; to make a rought of.
3. Sketch (n.) To plan or describe by giving the principal points or ideas of.
4. Sketch (v. i.) To make sketches, as of landscapes.
