The Collaborative International Dictionary
Plumb \Plumb\, v. t. [imp. & p. p. Plumbed (pl[u^]md); p. pr. & vb. n. Plumbing (pl[u^]m"[i^]ng).]
To adjust by a plumb line; to cause to be perpendicular; as, to plumb a building or a wall.
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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. To seal with lead; as, to plumb a drainpipe.
To supply, as a building, with a system of plumbing.
Wiktionary
vb. (en-past of: plumb)
WordNet
adj. (of water depth) measured by a line and plumb [syn: sounded]
Usage examples of "plumbed".
She had plumbed depths of bitterness there, and, contrariwise, reached a point of happiness she had never believed possible.
Tungata plumbed it with the nylon rope before Craig began the descent.