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blackline

From Wiktionary, the free dictionary

English

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Etymology

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From black +‎ line; compare redline, greenline.

Noun

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blackline (plural blacklines)

  1. A document indicating the differences between two versions of another document.
  2. (firefighting) A line of deliberately burned material created to stop the advance of a larger fire.
    • 2011, Colorado Outdoors, volumes 49-50, page 11:
      A second squad uses drip torches to begin burning a 15- to 20-foot barrier or “blackline” inside the wetline.
    • 1991, Rangeland Technology Equipment Council Annual Report, USDA Forest Service:
      The helicopter is used to burn blacklines when the relative humidity is above 50%, temperature is below 50 degrees F, and wind speed is less than 6 mph.

Verb

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blackline (third-person singular simple present blacklines, present participle blacklining, simple past and past participle blacklined)

  1. (transitive) To compare versions of (a document) by this method.

See also

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Anagrams

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