: a lead weight attached to a line and used to indicate a vertical direction
1
: straight down or up : vertically
2
chiefly dialectal
: to a complete degree : absolutely
'you're plumb crazy', she remarked, with easy candor—Harper's Weekly
3
: in a direct manner : exactly
also
: without interval of time : immediately
plumbed; plumbing; plumbs
1
: to weight with lead
2
a
: to measure the depth of with a plumb
b
: to examine minutely and critically
plumbing 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
: to work as a plumber
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Merriam-Webster unabridged
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