to charge less than (a competitor) for goods or services

to cut away the lower part of (something)

to cut or wear away material from the underside of (something) so as to leave a portion overhanging

to strike (a ball) with a downward glancing blow so as to give backspin or elevation to the shot

the action or result of undercutting

Brit the underside of a sirloin of beef

NAmer a notch cut in a tree before felling to determine the direction in which it will fall