Definition of dull verb from the Oxford Advanced American Dictionary

     

    dull

     verb
    verb
    NAmE//dʌl//
     
    Verb Forms present simple I / you / we / they dull
     
    he / she / it dulls
     
    past simple dulled
     
    -ing form dulling
     
     
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    pain
  1. 1[transitive, intransitive] dull (something) (of pain or an emotion) to become or be made weaker or less severe The pills they gave him dulled the pain for a while.
  2. person
  3. 2[transitive] dull somebody to make a person slower or less lively He felt dulled and stupid with sleep.
  4. colors, sounds
  5. 3[intransitive, transitive] to become or to make something less bright, clean, or sharp His eyes dulled and he slumped to the ground. dull something The endless rain seemed to dull all sound.
See the Oxford Advanced Learner's Dictionary entry: dull