navy blue

a dark blue.

Origin of navy blue

First recorded in 1830–40

na·vy-blue, adjective

Finally, in a navy-blue school uniform, Maria looks straight into the camera.

Does the Media Hate Women? |Jessica Bennett |October 20, 2011 |DAILY BEAST
Both of them showed the same splendid contrast of navy-blue jerseys against sea eyes and spray-stung red and russet skins.

A Poor Man's House |Stephen Sydney Reynolds
It was a new one, a birthday present from the family; navy-blue silk, with a handle topped with gold.

Lady Cassandra |Mrs George de Horne Vaizey
Put on that navy-blue dress of yours and I'll take you to the show.

Sister Carrie |Theodore Dreiser

Navy-blue serge, fashioned by Bancroft's best tailor to fit Roger Fairchild, who was much too plump for ready-made clothes.

The Cinder Pond |Carroll Watson Rankin
When he rang the bell he was an immensely grown-up lawyer (though he couldn't get his worn, navy-blue tie to hang exactly right).

The Trail of the Hawk |Sinclair Lewis

navy blue

Sometimes shortened to: navy

C19: from the colour of the British naval uniform