Definition of "Undercut" :

noun: a cut made underneath to remove material

noun: (sports) a stroke that puts reverse spin on the ball

noun: a notch cut in the trunk of tree in order to determine the direction of its fall

noun: the tender meat of the loin muscle on each side of the vertebral column

noun: the material removed by a cut made underneath

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

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

verb: cut away the underpart of

"Undercut a vein of ore."

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

verb: sell cheaper than one's competition