From The Collaborative International Dictionary of English v.0.44 [gcide]:
Plumb \Plumb\, verb (used with an object) [imp. & p. p. {Plumbed} (pl[u^]md); p. pr. & vb. n. {Plumbing} (pl[u^]m"[i^]ng).]
1. To adjust by a plumb line; to cause to be perpendicular; as, to plumb a building or a wall.
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.
He did not attempt to plumb his intellect. --Ld. Lytton.
3. To seal with lead; as, to plumb a drainpipe.
4. To supply, as a building, with a system of plumbing.
From WordNet (r) 2.0 [wn]:
adjective
1: (of water depth) measured by a line and plumb [syn: {sounded}]
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