"plumbs" in the noun sense
1. plumb bob, plumb, plummet
the metal bob of a plumb line
"plumbs" in the verb sense
1. plumb
measure the depth of something
2. plumb
weight with lead
3. plumb
examine thoroughly and in great depth
4. plumb
adjust with a plumb line so as to make vertical
Source: WordNet® (An amazing lexical database of English)
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