Dictionary.com
definitions

plumb

[pluhm]
See more synonyms for plumb on Thesaurus.com
noun
  1. a small mass of lead or other heavy material, as that suspended by a line and used to measure the depth of water or to ascertain a vertical line.Compare plumb line.
adjective Also plum.
  1. true according to a plumb line perpendicular.
  2. Informal. downright or absolute.
adverb Also plum.
  1. in a perpendicular or vertical direction.
  2. exactly, precisely, or directly.
  3. Informal. completely or absolutely: She was plumb mad. You're plumb right.
verb (used with object)
  1. to test or adjust by a plumb line.
  2. to make vertical.
  3. Shipbuilding. horn(def 32).
  4. to sound with or as with a plumb line.
  5. to measure (depth) by sounding.
  6. to examine closely in order to discover or understand: to plumb someone's thoughts.
  7. to seal with lead.
  8. to weight with lead.
  9. to provide (a house, building, apartment, etc.) with plumbing.
verb (used without object)
  1. to work as a plumber.
Idioms
  1. out of/off plumb, not corresponding to the perpendicular; out of true.

Origin of plumb

1250–1300; Middle English plumbe, probably < Anglo-French *plombe < Vulgar Latin *plumba, for Latin plumbum lead
Related formsplumb·a·ble, adjectiveplumb·less, adjectiveplumb·ness, nounre·plumb, verb (used with object)un·plumb, adjective
Can be confusedplum plumb

Synonyms for plumb

See more synonyms for on Thesaurus.com
2. vertical, straight, square.

Plumb

[pluhm]
noun
  1. J(ohn) H(arold),1911–2001, British historian.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for plumb

penetrate, explore, unravel, fathom, delve, upright, straight, sheer, perpendicular, erect, sound, search, gauge, measure

Examples from the Web for plumb

Contemporary Examples of plumb

Historical Examples of plumb

  • He'll be plumb stoop-shouldered if he don't hurry up and get the new kicked off of 'em.

    The Spenders

    Harry Leon Wilson

  • It is the vertebra which steadies him plumb up to a positive perpendicular.

  • You bet I shut him up quick—saying a thing like that about a plumb stranger.

    Ruggles of Red Gap

    Harry Leon Wilson

  • If all this newspaper stuff is so Albert was right all the time and I was plumb wrong.

    The Portygee

    Joseph Crosby Lincoln

  • It's my sobri'ty that's my ondoin', that an' bein' plumb moral.

    Faro Nell and Her Friends

    Alfred Henry Lewis

British Dictionary definitions for plumb

plumb

noun
  1. a weight, usually of lead, suspended at the end of a line and used to determine water depth or verticality
  2. the perpendicular position of a freely suspended plumb line (esp in the phrases out of plumb, off plumb)
adjective Also: plum
  1. (prenominal) informal, mainly US (intensifier)a plumb nuisance
adverb Also: plum
  1. in a vertical or perpendicular line
  2. informal, mainly US (intensifier)plumb stupid
  3. informal exactly; precisely (also in the phrase plumb on)
verb
  1. (tr often foll by up) to test the alignment of or adjust to the vertical with a plumb line
  2. (tr) to undergo or experience (the worst extremes of misery, sadness, etc)to plumb the depths of despair
  3. (tr) to understand or master (something obscure)to plumb a mystery
  4. to connect or join (a device such as a tap) to a water pipe or drainage system
Derived Formsplumbable, adjective

Word Origin for plumb

C13: from Old French plomb (unattested) lead line, from Old French plon lead, from Latin plumbum lead
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for plumb
n.

"lead hung on a string to show the vertical line," early 14c., from Old French *plombe, plomee "sounding lead," and directly from Late Latin *plumba, originally plural of Latin plumbum "lead (the metal), lead ball; pipe; pencil," a word of unknown origin, related to Greek molybdos "lead" (dialectal bolimos) and perhaps from an extinct Mediterranean language, perhaps Iberian.

v.

early 15c., "to sink" (like lead), from plumb (n.). Meaning "take soundings with a plumb" is first recorded 1560s; figurative sense of "to get to the bottom of" is from 1590s. Related: Plumbed; plumbing.

adj.

"perpendicular, vertical," mid-15c., from plumb (n.). The notion of "exact measurement" led to extended sense of "completely, downright" (1748), sometimes spelled plump, plum, or plunk.

Online Etymology Dictionary, © 2010 Douglas Harper