Definition of have a big mouthinformal
- Be careful of what you say around her—she has a big mouth.
: of great strength
: of great force
: large or great in dimensions, bulk, or extent
: in a loud or declamatory manner
: to a large amount or extent
: on a large scale
: an individual or organization of outstanding importance or power
: a big player : a center or forward whose large size and strength are used to control play near the basket
: the natural opening through which food passes into the body of an animal and which in vertebrates is typically bounded externally by the lips and internally by the pharynx and encloses the tongue, gums, and teeth
: an individual requiring food
: speak, pronounce
: to utter bombastically : declaim
: to repeat without comprehension or sincerity
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