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The Collaborative International Dictionary
hickup

Hiccough \Hic"cough\ (?; 277), n. [OE. hickup, hicket, hickock; prob. of imitative origin; cf. D. & Dan. hik, Sw. hicka, Armor. hak, hik, W. ig, F. hoquet.] (Physiol.) A modified respiratory movement; a spasmodic inspiration, consisting of a sudden contraction of the diaphragm, accompanied with closure of the glottis, so that further entrance of air is prevented, while the impulse of the column of air entering and striking upon the closed glottis produces a sound, or hiccough. [Written also hickup or hiccup.]

Wiktionary
hickup

n. (archaic spelling of hiccup English) vb. (archaic spelling of hiccup English)