Blackline

noun, verb

noun, verb ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A document indicating the differences between two versions of another document.
  2. 2
    A 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."

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

Example

More examples

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

Etymology

From black + line; compare redline, greenline.

Related phrases

blackline tilefish

More for "blackline"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.