Definitions of mouth:

• noun:   the opening of a jar or bottle

  Example: "The jar had a wide mouth"

• noun:   the externally visible part of the oral cavity on the face and the system of organs surrounding the opening

  Example: "She wiped lipstick from her mouth"

• noun:   the opening through which food is taken in and vocalizations emerge

  Example: "He stuffed his mouth with candy"

• noun:   the point where a stream issues into a larger body of water

  Example: "New York is at the mouth of the Hudson"

• noun:   an opening that resembles a mouth (as of a cave or a gorge)

  Example: "He rode into the mouth of the canyon"

• noun:   a person conceived as a consumer of food

  Example: "He has four mouths to feed"

• noun:   a spokesperson (as a lawyer)
• noun:   an impudent or insolent rejoinder
• verb:   articulate silently; form words with the lips only

  Example: "She mouthed a swear word"

• verb:   touch with the mouth
• verb:   express in speech