slipstream

[slip-streem]

slip·stream

[slip-streem]
noun Also, slip stream.
1.
Aeronautics. the airstream pushed back by a revolving aircraft propeller. Compare backwash (def. 2), wash (def. 31).
2.
the airstream generating reduced air pressure and forward suction directly behind a rapidly moving vehicle.
verb (used without object)
3.
to ride in the slipstream of a fast-moving vehicle.

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Slipstream is always a great word to know.
So is restoring force. Does it mean:
fractional volume change of a body due to uniform pressure
force exerted by stretched or compressed spring, which restores it to resting length

Origin:
1910–15; slip1 + stream
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
slipstream (ˈslɪpˌstriːm)
 
n
1.  airstream, Also called: race
 a.  the stream of air forced backwards by an aircraft propeller
 b.  a stream of air behind any moving object
 
vb
2.  motor racing to follow (another car, etc) closely in order to take advantage of the decreased wind resistance immediately behind it

Collins English Dictionary - Complete & Unabridged 10th Edition
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