British spelling variant of the present participle of hiccup; currently making involuntary hiccup sounds.
British English convention of doubling the final consonant of one-syllable words before adding '-ing' or '-ed'.
The double-p in 'hiccupping' is purely a regional convention—Americans say 'hiccuping,' but British writers would use 'hiccupping,' and both are equally valid in their own dialect.
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