Definition of big day noun from the Oxford Advanced Learner's Dictionary


    big day

    BrE BrE//ˌbɪɡ ˈdeɪ//
    ; NAmE NAmE//ˌbɪɡ ˈdeɪ//
    [usually singular] (informal)
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  1. 1a very important day, especially for a particular person or group Saturday promises to be a big day for Irish sport. The children enjoyed themselves preparing for their big day.
  2. 2a person's wedding day Her family travelled to Australia for the big day.