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air dam

noun

, Automotive.
  1. a spoiler mounted at the front of an automobile to reduce air flow on the underside of the chassis to increase stability.


air dam

noun

  1. any device, such as a spoiler, that reduces air resistance and increases the stability of a car, aircraft, etc
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of air dam1

First recorded in 1970–75
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Example Sentences

The Appalachian Mountains often trap the dense, icy air layer, known as a cold air dam, while Atlantic winds usher in a milder air mass that glides up and over the top.

The highest impact ice event of that winter unfolded Feb. 10-11, with a massive cold air dam that stretched east of the Appalachians from Maine to Georgia.

There, a stalled frontal boundary enabled milder air to slide up and over the cold air dam.

The cold air gets trapped against the eastern slopes of the Appalachians, forming a shallow dome of subfreezing air called a cold air dam or wedge.

The subfreezing air wedge/cold air dam is shown in blue; the milder air wedge is shaded orange.

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