n. 25B6; noun
open your mouth : lips, jaws; maw, muzzle; informal trap, chops, kisser; Brit. informal gob, cakehole; N. Amer. informal puss, bazoo.
the mouth of the cave : ENTRANCE, opening, entry, way in, access, ingress.
the mouth of the bottle : OPENING, rim, lip.
the mouth of the river : OUTFALL, outlet, debouchment; estuary, firth.
(informal) he's all mouth : BOASTING, bragging, idle talk, bombast, braggadocio; informal hot air.
(informal) you've got a lot of mouth : IMPUDENCE, cheek, cheekiness, insolence, impertinence, effrontery, presumption, presumptuousness, rudeness, disrespect; informal lip, (brass) neck; Brit. informal sauce, backchat; N. Amer. informal sass, sassiness, back talk.
25B6; verb he mouthed platitudes : UTTER, speak, say; pronounce, enunciate, articulate, voice, express; say insincerely, say for form's sake.
25A0; down in the mouth (informal) . See unhappy sense 1.
25A0; keep one's mouth shut (informal) SAY NOTHING, keep quiet, not breathe a word, not tell a soul; informal keep mum, not let the cat out of the bag.
25A0; mouth off (informal) RANT, spout, declaim, sound off.