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

big day

noun
 
/ˌbɪɡ ˈdeɪ/
 
/ˌbɪɡ ˈdeɪ/
[usually singular] (informal)
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  1. a 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. a person's wedding day
    • Her family travelled to Australia for the big day.
trait
noun
 
 
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