firecockEtymologyFrom fire + cock (“valve or tap for controlling flow”). First attested in the early 18th century, with the earliest use found in acts of Parliament.firecock means A cock or spout to let out water for extinguishing fires; a fireplug; a hydrant. Lexicurio rates it Rare gem — a strength score of 79 out of 100.nounA cock or spout to let out water for extinguishing fires; a fireplug; a hydrant.