A hiccup (hiccough) is a spasm or involuntary contraction of the diaphragm (muscular membrane separating the abdominal and thoracic cavities which assists respiration).
This results in a sudden inhalation that is aborted by an equally sudden closure of the vocal cords - which generates a unique sound, identified as the hiccup.
Looking at an object for curing hiccup
Holding your breath for curing your hiccup
How do I prevent hiccups from recurring?
What causes hiccups?
What symptoms can be associated with hiccups?