n.
Function: transitive verb
Date: 15th century
1 : to weight with lead
2 a : to measure the depth of with a plumb b : to examine minutely and critically < plumb ing the book's complexities>
3 : to adjust or test by a plumb line
4 : to seal with lead
5 [back-formation from plumber ] : to supply with or install as plumbing
intransitive verb : to work as a plumber