Sentence:  He also bought a huge square of pegboard for hanging up his tools , and lumber for his workbench , sandpaper and glue and assorted nails , levels and T squares and <WSD>plumb</WSD> lines and several gadgets that he had no idea how to use or what they were for . 
Meaning of the word marked with <WSD> tags:  a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point