Definition of diminish verb from the Oxford Advanced American Dictionary

      

    diminish

     verb
    verb
    NAmE//dɪˈmɪnɪʃ//
     
    Verb Forms present simple I / you / we / they diminish
     
    he / she / it diminishes
     
    past simple diminished
     
    -ing form diminishing
     
     
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  1. 1[intransitive, transitive] diminish (something) to become or to make something become smaller, weaker, etc. synonym decrease The world's resources are rapidly diminishing. His influence has diminished with time. Our efforts were producing diminishing returns (= we achieved less although we spent more time or money).
  2. 2[transitive] diminish somebody/something to make someone or something seem less important than they really are synonym belittle I don't wish to diminish the importance of their contribution.
See the Oxford Advanced Learner's Dictionary entry: diminish