navy blue
US /ˌneɪ.vi ˈbluː/
UK /ˌneɪ.vi ˈbluː/
1.
a very dark blue color, similar to the color of the uniforms worn by sailors in the navy
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She wore a classic navy blue suit to the interview.
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The walls were painted a deep navy blue.
1.
a very dark blue color
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The new uniform is a rich navy blue.
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She chose navy blue for the accent wall.