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Definition of "redline" [redline]

  • To refuse home mortgages or home insurance to areas or neighborhoods deemed poor financial risks. (verb-intransitive)
  • To reach the maximum engine speed at which an engine is designed to be safely operated: The car redlined at 80 miles per hour in fourth gear. (verb-intransitive)
  • Computer Science To mark or highlight edited text, as with a red line, to distinguish it from unedited portions of a document. (verb-intransitive)
  • To discriminate against by refusing to grant loans, mortgages, or insurance to. (verb-transitive)
  • To remove from operational status because of mechanical defects or the need for scheduled maintenance: redlined three fighter aircraft. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "redline" in a sentence
  • "Microsoft Word has this this editing thing called redline/strikethrough or strikeout or something."
  • "When we got back [from White House staff] this extensive edited version, called the redline, two days before we were supposed to submit the report to Congress on March 29, 2007, that paragraph was deleted."
  • "But it blows them away in fuel consumption (17 / 25 mpg TDI, 14 / 19 mpg for the V-6 gasoline, 12 / 17 mpg for the V-8 FSI gasoline), and it performs much like the V-8 minus a little top end urge because the redline is a bit below 5,000 rpm."