sian-tiǎu先兆

harbinger

harbinger; forewarning; omen; premonition; augury; portent; aura

medicine

English Wiktionary, “先兆” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%85%88%E5%85%86 · confidence: Medium (Wiktionary, Hokkien)