Definition of dull verb from the Oxford Advanced Learner's Dictionary

     

    dull

     verb
    verb
    BrE BrE//dʌl//
     
    ; NAmE NAmE//dʌl//
     
    Verb Forms present simple I / you / we / they dull
    BrE BrE//dʌl//
     
    ; NAmE NAmE//dʌl//
     
    he / she / it dulls
    BrE BrE//dʌlz//
     
    ; NAmE NAmE//dʌlz//
     
    past simple dulled
    BrE BrE//dʌld//
     
    ; NAmE NAmE//dʌld//
     
    past participle dulled
    BrE BrE//dʌld//
     
    ; NAmE NAmE//dʌld//
     
    -ing form dulling
    BrE BrE//ˈdʌlɪŋ//
     
    ; NAmE NAmE//ˈdʌlɪŋ//
     
     
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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 tablets they gave him dulled the pain for a while. The heat dulled my enjoyment of the journey.
  2. person
  3. 2[transitive] dull somebody to make a person slower or less lively He felt dulled and stupid with sleep.
  4. colours/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.
  6. Word Origin Old English dol ‘stupid’, of Germanic origin; related to Dutch dol ‘crazy’ and German toll ‘mad, fantastic, wonderful’.
See the Oxford Advanced American Dictionary entry: dull