Definition of plumb adverb from the Oxford Advanced American Dictionary

     

    plumb

     adverb
    adverb
    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) (informal) completely He's plumb crazy.
See the Oxford Advanced Learner's Dictionary entry: plumb