- noun a two-winged fly, whose maggots live in decomposing flesh, but are sometimes also found on living sheep
- noun a police officer. A term popular in the 1950s and still heard. It has been used in Britain since the 16th century, well before policemen wore uniforms, and indeed existed in any organised form, which suggests that the original reference was to an annoying pestilential presence.
- noun a two-winged fly, with a shining blue body, whose maggots live in decomposing meat