blabbermouth

noun

Etymology: From blabber + mouth.

1. A gossip.

   “If it weren't for that blabbermouth Sally, the principal would never have known we did it.”

2. A person who talks excessively.
3. A kind of foam-dispensing nozzle used in firefighting at airports.

   “Two handlines are capable of 240 gpm and an undertruck "blabbermouth" nozzle can sweep the ground ahead at 240 gpm.”

   “The monitor is fitted with a blabbermouth (variable nozzle) to enable jet-spray patterns to be obtained at will.”