undercutter

Noun

 * 1) One who, or that which, undercuts.
 * 2) A type of plough.
 * 3)  A type of bit.
 * 4) A device for excavation, used on railways.
 * 5)  A device for cutting into rock walls from below.
 * 1)  A type of bit.
 * 2) A device for excavation, used on railways.
 * 3)  A device for cutting into rock walls from below.
 * 1)  A device for cutting into rock walls from below.
 * 1)  A device for cutting into rock walls from below.