blackline

plural blacklines

1. A document indicating the differences between two versions of another document.
2. firefightingA line of deliberately burned material created to stop the advance of a larger fire.

   A second squad uses drip torches to begin burning a 15- to 20-foot barrier or “blackline” inside the wetline.

   2011, Colorado Outdoors, volumes 49-50, page 11

   1 more example

   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.

   1991, Rangeland Technology Equipment Council Annual Report, USDA Forest Service

present singular third person blacklines · participle present blacklining · participle past blacklined · past blacklined

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