What is the meaning of undercut?

noun

• The material removed by a cut made underneath.
• The tender meat of the loin muscle on each side of the vertebral column.
  • synonyms: tenderloin
• A notch cut in the trunk of tree in order to determine the direction of its fall.
• Sports) a stroke that puts reverse spin on the ball. (
  • usage: "cuts do not bother a good tennis player"
  • synonyms: cut
• A cut made underneath to remove material.

verb

• Sell cheaper than one's competition.
  • synonyms: undersell
• Cut away material from the underside of (an object) so as to leave an overhanging portion in relief.
• Cut away the underpart of.
  • usage: "undercut a vein of ore"
• Strike (the ball) in golf, tennis, or hockey obliquely downward so as to give a backspin or elevation to the shot.
• Cut obliquely into (a tree) below the main cut and on the side toward which the tree will fall. .