–noun, plural -mouths /-ˌmaʊðz,-ˌmaʊθs/Show Spelled Pronunciation[-mouthz,-mouths]Show IPAfor 1;(especially collectively) -mouth, (especially referring to two or more kinds or species) -mouths for 2.
1.
a loud, talkative person, esp. one who lacks discretion.
2.
any of several fishes having an unusually large mouth.