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The Collaborative International Dictionary
Expanding drill

Expanding \Ex*pand"ing\, a. That expands, or may be expanded; extending; spreading; enlarging.

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.