腹泻
fù xiè · HSK 7
diarrhea
🚽 腹 = belly + 泻 = pour/drain out — belly drains out
腹 (fù) means belly/abdomen; 泻 (xiè) means to pour, drain, or flow rapidly (water radical 氵 on the left signals liquid). Together: the belly drains — the runs.
泻 — water radical 氵 + 写 (xiě, phonetic)
A semantic-phonetic compound: the water radical 氵 gives the meaning (flowing water), while 写 supplies the sound. It originally described water rushing or pouring down rapidly, and by extension came to mean to drain, discharge, or have diarrhea.