flag day
noun
1
capitalized F&D : June 14 observed in various states in commemoration of the adoption in 1777 of the official U.S. flag
2
British : a day on which charitable contributions are solicited in exchange for small flags
Example Sentences
Recent Examples on the Web Just three weeks ago, Vitaliy Gantchev stood on stage in a square in Kupyansk, addressing dozens of men, women and children on the occasion of Russian flag day. 
Isabel Coles, WSJ, 12 Sep. 2022 The season was organized to start on Ukraine’s national flag day, the day before the country celebrated its 1991 independence from the former Soviet Union. Kevin Baxter, Los Angeles Times, 30 Aug. 2022 Even on yellow flag day – classified as Medium Hazard with moderate surf and/or strong currents – Spivey recommended people play it safe in the Gulf. Leada Gore | Lgore@al.com, al, 20 July 2022 On November 9th, known as the national flag day in Azerbaijan, Baku burst into jubilation. The Economist, 14 Nov. 2020
Isabel Coles, WSJ, 12 Sep. 2022 The season was organized to start on Ukraine’s national flag day, the day before the country celebrated its 1991 independence from the former Soviet Union. Kevin Baxter, Los Angeles Times, 30 Aug. 2022 Even on yellow flag day – classified as Medium Hazard with moderate surf and/or strong currents – Spivey recommended people play it safe in the Gulf. Leada Gore | Lgore@al.com, al, 20 July 2022 On November 9th, known as the national flag day in Azerbaijan, Baku burst into jubilation. The Economist, 14 Nov. 2020 Word History
First Known Use
1894, in the meaning defined at sense 1