blue flag

American  

noun

1. any North American plant of the genus Iris, especially I. versicolor : the state flower of Tennessee.

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Blue Flag British  

noun

1. an award given to a seaside resort that meets EU standards of cleanliness of beaches and purity of water in bathing areas

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Etymology

Origin of blue flag

An Americanism dating back to 1775–85

Example Sentences

The drone feed shows the moment they briefly wave their yellow and blue flag, before quickly returning to cover.

From BBC

The joyous Al-Hilal fans, a large cluster of whom were directly behind the dugout, waved the blue flags of the club and the green and white of the country.

From BBC

Ever since then, I’ve been marking fruit on my map, and now I have a crazy map where you can’t see streets, you can’t see any highways, because it’s just blue flags everywhere.

From Los Angeles Times

The US island territory's red, white and blue flag adorns homes and businesses, and the sounds of salsa and reggaetón boom from passing cars and restaurants selling fried plantains and spit-roasted pork.

From BBC

It began with blue flags flapping from the dugout roofs and blue rags raised and waved through the rollicking full house.

From Los Angeles Times