Definition of yesterday adverb from the Oxford Advanced American Dictionary

  

yesterday

 adverb
adverb
NAmE//ˈyɛstərˌdeɪ//
 
, NAmE//ˈyɛstərdi//
 
 
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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.
  • Idioms
    not be born yesterday(informal)
     
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    used to say that you are not stupid enough to believe what someone is telling you Oh yeah? I wasn't born yesterday, you know.
    See the Oxford Advanced Learner's Dictionary entry: yesterday