1. (n.) A plant (Centaurea cyanus) which grows in grain fields. It receives its name from its blue bottle-shaped flowers.

2. (n.) A large and troublesome species of blowfly (Musca vomitoria). Its body is steel blue.

Dogberry John Law bluebottle bluecoat bull constable cop copper dick flatfoot flattie gendarme gumshoe officer paddy peeler pig shamus the cops the fuzz the law