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Curl over forwards (try to touch your chest to your thighs) and swallow the rest.

Tilt your head back and swallow about half.

Hold a big mouthful of water in your mouth. (Do not swallow immediately)

Sit yourself down on a seat.

Get some water in a cup.

Usually gets it on the first try. If not, the second should do it.

Hatsune Miku's How To Stop Hiccups for dummies.

Sankaku Channel/Post 419323