blues C2+

/bluːz/ a mood of melancholy; a melancholic African-American musical genre

blueprint C2+

/ˈbluˌprɪnt/ a detailed plan or technical drawing serving as a model

bluebottle C2+

/ˈbluˌbɑtəl/ a large buzzing fly with a metallic-blue body; (British slang) a policeman

bluecoat C2+

/ˈbluˌkoʊt/ a person wearing a blue uniform, especially a soldier or policeman

bluejacket C2+

/ˈbluˌdʒækɪt/ an enlisted sailor in the navy