verb
(intransitive) To draw in the breath suddenly, as if from a shock.
(intransitive) To breathe quickly or in a labored manner, as after exertion; to respire with heaving of the breast; to pant.
(transitive) To speak in a breathless manner.
To pant with eagerness or excitement; to show vehement desire.
noun
A short, sudden intake of breath.
(British, slang): A draw or drag on a cigarette (or gasper).
interjection
(humorous) The sound of a gasp.