発病
はつびょう · hatsubyou · JLPT N1 · noun
to become sick
🦠 発 = start + 病 = sickness: the moment sickness starts, you come down with it
発 means launch or start, and 病 means illness. Together they mark the onset of disease: the point where sickness first takes hold and you become ill.
病 — sickness radical 疒 + 丙 (bǐng, phonetic)
病 is a semantic-phonetic compound. The radical 疒 depicts a person lying on a bed and signals illness or ailment. The component 丙 supplies the sound (bǐng → bìng). Originally 病 referred to a serious illness, contrasted with 疾 for a lighter ailment; today it broadly means 'sick' or 'disease.'