BLUECOAT
bluecoat
(noun) a person dressed all in blue (as a soldier or sailor)
Source: WordNet® 3.1
Etymology
Noun
bluecoat (plural bluecoats)
(British) A traditional dress code at certain prestigious British schools
(US history) A soldier or officer in the Union army during the American Civil War
(dated) A policeman
Synonyms
• (police officer): see police officer
Source: Wiktionary
Blue"coat`, n.
Definition: One dressed in blue, as a soldier, a sailor, a beadle, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition