Mouth  —n. (pl. Mouths) 1 a external opening in the head, through which most animals take in food and emit communicative sounds. B (in humans and some animals) cavity behind it containing the means of biting and chewing and the vocal organs. 2 opening of a container, cave, trumpet, etc. 3 place where a river enters the sea. 4 an individual as needing sustenance (an extra mouth to feed). 5 colloq. A meaningless or ineffectual talk. B impudent talk; cheek. —v. (-thing) 1 say or speak by moving the lips but with no sound. 2 utter or speak insincerely or without understanding (mouthing platitudes).  put words into a person's mouth represent a person as having said something. Take the words out of a person's mouth say what another was about to say. [old english]