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From: Webster's Revised Unabridged Dictionary (1913)

 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.