GNU Collaborative International Dictionary of English

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Found one definition

1.       
   chalk line (cha̤kˈ līnˌ), n.
   1. a string impregnated with powdered chalk, used in construction to mark a straight line on a surface, such as a wall.  The string is held taut on the surface between the two end points of the line to be made, the center of the line is drawn away from the surface, and the string is released and snapped against the surface, leaving a line of chalk in the desired location.
   
   [PJC]
   
   
   2. the line of chalk on a surface left by a chalk line{1.
   
   [PJC]