Definition of diet verb from the Oxford Advanced American Dictionary

     

    diet

     verb
    verb
    NAmE//ˈdaɪət//
     
    [intransitive]Verb Forms present simple I / you / we / they diet
     
    he / she / it diets
     
    past simple dieted
     
    -ing form dieting
     
     
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  1. 1to eat less food or only food of a particular type in order to lose weight synonym be on a diet
  2. 2 She's always dieting, but she never seems to lose any weight.
See the Oxford Advanced Learner's Dictionary entry: diet