Definition of plumb adverb from the Oxford Advanced Learner's Dictionary



    BrE BrE//plʌm//
    ; NAmE NAmE//plʌm//
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  1. 1(used before prepositions) exactly He was standing plumb in the middle of the road.
  2. 2(old-fashioned, North American English, informal) completely He's plumb crazy.
  3. Word Originadverb Middle English (originally in the sense ‘sounding lead’): via Old French from Latin plumbum ‘lead’.
See the Oxford Advanced American Dictionary entry: plumb