[v. red-lahyn; n. red-lahyn]
verb (used with object), redlined, redlining.
to treat by redlining (an area or neighborhood).
to establish the recommended safe speed of (an airplane): The bomber is redlined at 650 miles an hour.
to draw a canceling red line through (an item on a list).
to mark or designate for cancellation, rejection, dismissal, or the like: club members redlined for unpaid dues.
to cause (an airplane) to be grounded.
verb (used without object), redlined, redlining.
to engage in redlining.
the maximum rotational speed, or angular velocity, of the engine crankshaft that is considered safe: often measured in rpm.
a red line or boundary of a red area that delineates such a value, as on a tachometer.
Also, red-line.

1940–45; red1 + line1

redliner, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
redline (ˈrɛdˌlaɪn)
1.  (esp of a bank or group of banks) to refuse a loan to (a person or country) because of the presumed risks involved
2.  to restrict people's access to goods or services on the basis of the area in which they live

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"deny loans to certain neighborhoods based on ethnicity," 1973, on notion of lines drawn on maps. Used earlier in ref. to insurance company practices (1961) and in World War II military slang in ref. to a red line drawn through a soldier's name for some infraction, thus denying his pay.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The power comes on fairly low in the rev range, and then evenly all the way to redline.
It shifts up smoothly, and will run the engine to its redline during full-throttle acceleration.
The transmission is designed to upshift at redline to protect the engine.
The engine revs freely and smoothly and will tolerate near-redline rpm without squawking.
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