Moving with great speed, celerity, velocity, or rapidity; fleet; rapid; speedy.Ready; prompt; quick.Of short continuance; swiftly or rapidly passing.n. The swifter part of a stream; the current.n. An adjustable machine upon which a skein of yarn, silk, or other thread is put, in order that it may be wound off.n. The main card-cylinder in a flax-carding machine.n. A bird of the family Cypselidæ: so called from its rapidity of flight.n. A breed of domestic pigeons, of which there are several color-varieties.n. The common newt or eft.n. One of several small lizards which run with great swiftness, as the common brown fence-lizard of the United States, Sceloporus undulatus. See cut under Sceloporus.n. A ghost-swift, ghost-moth, or goat-moth; one of the Epialidæ: so called from the rapid flight.n. A goat-moth, Epialus vellida.In a swift or rapid manner; swiftly.To reef (a sail).n. A tackle used in tightening standing rigging.