English

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

 

diet

 verb
verb
BrE BrE//ˈdaɪət//
 
; NAmE NAmE//ˈdaɪət//
 
Verb Forms present simple I / you / we / they diet
BrE BrE//ˈdaɪət//
 
; NAmE NAmE//ˈdaɪət//
 
he / she / it diets
BrE BrE//ˈdaɪəts//
 
; NAmE NAmE//ˈdaɪəts//
 
past simple dieted
BrE BrE//ˈdaɪətɪd//
 
; NAmE NAmE//ˈdaɪətɪd//
 
past participle dieted
BrE BrE//ˈdaɪətɪd//
 
; NAmE NAmE//ˈdaɪətɪd//
 
-ing form dieting
BrE BrE//ˈdaɪətɪŋ//
 
; NAmE NAmE//ˈdaɪətɪŋ//
 
 
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[intransitive] to eat less food or only food of a particular type in order to lose weight synonym be on a diet She's always dieting but she never seems to lose any weight. Word Origin Middle English: from Old French diete (noun), dieter (verb), via Latin from Greek diaita ‘a way of life’.
See the Oxford Advanced American Dictionary entry: diet