Etymology
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hiccough

1620s, a more recent variant of hiccup (q.v.) by mistaken association with cough.

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Definitions of hiccough
1
hiccough (v.)
breathe spasmodically, and make a sound;
Synonyms: hiccup
2
hiccough (n.)
(usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion;
Synonyms: hiccup / singultus
From wordnet.princeton.edu