しゃっくり
しゃっくり · shakkuri · JLPT N2 · noun
hiccup
Onomatopoeia: shakkuri mimics the sharp shak-ku jolt of a hiccup
The doubled consonant in kku gives a short, sudden catch, matching the abrupt spasm of the diaphragm. Japanese has many sound-symbolic words like this for body sensations.