chalk line

noun Building Trades.
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.
the line so made.

1400–50; late Middle English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To chalk line
Example sentences
Mark these locations at intervals equal to the length of the chalk line used
  for marking.
They draw a chalk line around their sun dome squares so that they can return to
  the same place later that day.
Old time group photographers used to put a chalk line on the ground.
Layout tools such as soapstone, chalk line, or carpenter's square.
Image for chalk line
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