A soldier in a blue uniform
A student at a charity school with a blue uniform
A boy who attends a blue coat school: see blue coat school.
A girl who attends a blue coat school: see blue coat school.
= blue coat school.
A charity school at which pupils wear blue coats; specifically. Christ's Hospital, originally situated in Newgate, London, now in Horsham, West Sussex; (later more generally) any charity school; now also in the names of conventional schools, some of which were originally charity schools.