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

     

    flag day

     noun
    noun
    BrE
     
    ; NAmE
     
    Helping others
     
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  1. 1(British English) a day when money is collected in public places for a charity, and people who give money receive a small paper sticker See related entries: Helping others
  2. 2Flag Day 14 June, the anniversary of the day in 1777 when the Stars and Stripes became the national flag of the United States
See the Oxford Advanced American Dictionary entry: flag day