Definition of yesterday adverb from the Oxford Advanced Learner's Dictionary

  

yesterday

 adverb
adverb
BrE BrE//ˈjestədeɪ//
 
; NAmE NAmE//ˈjestərd//
 
; BrE BrE//ˈjestədi//
 
; NAmE NAmE//ˈjestərdi//
 
 
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  • on the day before today They arrived yesterday. I can remember our wedding as if it were yesterday. Where were you yesterday morning? To think I was lying on a beach only the day before yesterday.
  • Word Origin Old English giestran dæg (from yester- Old English geostran, of Germanic origin + day).Idioms (informal) used to say that you are not stupid enough to believe what somebody is telling you Oh yeah? I wasn't born yesterday, you know.
    See the Oxford Advanced American Dictionary entry: yesterday