downdraught | downdraft, n. and adj.
a. Sc. A person who or thing which drags or weighs someone down; a depressing influence; a burden. Cf. down-drag n. Now rare. Sc. National Dict. (at Doon) records this phrase as still in use in Angus and Stirling in 1940.
†b. Chiefly Sc. A profligate person; a ne'er-do-well. Obsolete.
a. The downward movement of air through a chimney; a current of air drawn downward through a chimney.
b. A downward-moving draught in a room or other confined space, such as one coming from a vent or window.
c. Meteorology. A descending current of air.
d. The powerful downward blast of air generated by the rotors of a helicopter, esp. that coming from a helicopter on or close to the ground; an instance of this.In quot. 1908 with reference to a small, unmanned model of an early helicopter designed and built by French inventor Paul Cornu.
3. Chiefly in form downdraft. A depressing economic force or influence; (in weakened use) a decline in economic activity or the value of a stock, a market, etc.; a downturn.Quot. 1852 shows an apparently isolated early example. Modern use originated in the United States as a meteorological metaphor; cf. sense A. 2c.
1. Designating a furnace, kiln, etc., in which heated air rises up before being deflected and drawn down into the main chamber.
2. Designating a carburettor in which air enters at the top of the unit and passes downwards before mixing with fuel.
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