undercutting

(verb) sell cheaper than one's competition. Synonyms: undersell, undercut.

(verb) cut away material from the underside of (an object) so as to leave an overhanging portion in relief. Synonyms: undercut.

(verb) cut away the underpart of. Synonyms: undercut. Example: "Undercut a vein of ore."

(verb) strike (the ball) in golf, tennis, or hockey obliquely downward so as to give a backspin or elevation to the shot. Synonyms: undercut.

(verb) cut obliquely into (a tree) below the main cut and on the side toward which the tree will fall. Synonyms: undercut.