Ex·pand v. t. [imp. & p. p. Expanded; p. pr. & vb. n. Expanding.]
1. To lay open by extending; to open wide; to spread out; to diffuse; as, a flower expands its leaves.
Then with expanded wings he steers his flight. --Milton.
2. To cause the particles or parts of to spread themselves or stand apart, thus increasing bulk without addition of substance; to make to occupy more space; to dilate; to distend; to extend every way; to enlarge; -- opposed to contract; as, to expand the chest; heat expands all bodies; to expand the sphere of benevolence.
3. Math. To state in enlarged form; to develop; as, to expand an equation. See Expansion, 5.
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.
adj : increasing in area or volume or bulk or range; "an expanding
universe"; "an expanding economy"