chalk line

noun Building Trades.
  1. a chalked string for making a straight line on a large surface, as a wall, by holding the string taut against the surface and snapping it to transfer the chalk.
  2. the line so made.

Origin of chalk line

late Middle English word dating back to 1400–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for chalk line

Historical Examples of chalk line