Dark Blue
/ˌdɑːk ˈbluː/noun
A name for: an Oxford University sports team, often wearing distinctive jerseys, etc., of this colour (usually with the). Also (chiefly in plural): a member of an Oxford University sports team.
adjective
Of or designating an Oxford University sports team.
Origin
Mid 19th century; earliest use found in Bell's Life in Sydney. From dark + blue, with reference to the shade of blue adopted by Oxford University as its colour.