'Expanding bit' definitions:

Definition of 'Expanding bit'

From: GCIDE
  • Expanding \Ex*pand"ing\, a. That expands, or may be expanded; extending; spreading; enlarging. [1913 Webster]
  • Expanding bit, Expanding drill (Mech.), a bit or drill made adjustable for holes of various sizes; one which can be expanded in diameter while boring.
  • Expanding pulley (Mach.), a pulley so made, as in sections, that its diameter can be increased or diminished. [1913 Webster]