A smile in which the lips are parted to reveal the teeth.

(obsolete) A snare; a gin.

(intransitive) To smile, parting the lips so as to show the teeth.

(transitive) To express by grinning.

(intransitive, dated) To show the teeth, like a snarling dog.

(transitive) To grin as part of producing a particular facial expression, such as a smile or sneer.