redline

or red-line

[ verb red-lahyn; noun red-lahyn ]
/ verb ˈrɛdˌlaɪn; noun ˈrɛdˈlaɪn /

verb (used with object), red·lined, red·lin·ing.

verb (used without object), red·lined, red·lin·ing.

to engage in redlining.

noun

Automotive.
  1. the maximum rotational speed, or angular velocity, of the engine crankshaft that is considered safe: often measured in rpm.
  2. a red line or boundary of a red area that delineates such a value, as on a tachometer.

Origin of redline

First recorded in 1940–45; red1 + line1
Related formsred·lin·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for redline

British Dictionary definitions for redline

redline

/ (ˈrɛdˌlaɪn) /

verb (tr)

(esp of a bank or group of banks) to refuse a loan to (a person or country) because of the presumed risks involved
to restrict people's access to goods or services on the basis of the area in which they live
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

Word Origin and History for redline

redline


v.

also red-line, "mark in red ink," 1820, from red (adj.1) + line (v.). Specific sense of "deny loans to certain neighborhoods based on ethnicity" is from 1973, on notion of lines drawn on maps. Used earlier in reference to insurance company practices (1961) and in World War II military slang in reference to a red line drawn through a soldier's name for some infraction, thus denying his pay. Related: Redlined; redlining.

Online Etymology Dictionary, © 2010 Douglas Harper