GNU Collaborative International Dictionary of English

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1.       
   Plumb, v. t. [imp. & p. p. Plumbed (plŭmd); p. pr. & vb. n. Plumbing (plŭmˈĭng).]
   1. To adjust by a plumb line; to cause to be perpendicular; as, “to plumb a building or a wall”.
   
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   2. To sound with a plumb or plummet, as the depth of water; hence, to examine by test; to ascertain the depth, quality, dimension, etc.; to sound; to fathom; to test.
   
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   He did not attempt to plumb his intellect. Ld. Lytton.
   
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   3. To seal with lead; as, “to plumb a drainpipe”.
   
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   4. To supply, as a building, with a system of plumbing.
   
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