blabbermouth

plural blabbermouths

1. derogatoryinformalA gossip.

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

   Synonyms: carrytale, blab, blabtale, blabtongue, busybody, buzzer, gossip, gossiper

2. derogatoryinformalA person who talks excessively.

   Synonyms: airbag, babblemouth, babbler, bag of wind, blab, blabberer, blatherer, blatherskite

3. aeronauticsA kind of foam-dispensing nozzle used in firefighting at airports.

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

   1972, ICAO Bulletin, volume 27, page x

   2 more examples

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

   1964, Civic Administration, volume 16, page 9

   A manually operated monitor is provided complete with blabbermouth to deliver foam solution at a rate of 2(KX) lures a minute at 10-5 bar, to a maximum jet range of 46 metres […]

   1983, David F. Rider, Jane's Airport Equipment, page 210