To open the mouth wide; as:
(a)
Expressing a desire for food; as, young birds gape.
(b)
Indicating sleepiness or indifference; to yawn. "She stretches, gapes, unglues her eyes, And asks if it be time to rise."
(c)
Showing unselfconsciousness in surprise, astonishment, expectation, etc. "With gaping wonderment had stared aghast."
(d)
Manifesting a desire to injure, devour, or overcome. "They have gaped upon me with their mouth."