黑马
hēi mǎ · HSK 7
horse
🐎 黑 black + 马 horse = literally black horse; English uses dark horse for a surprise winner
The two characters map one-to-one onto the English idiom: 黑 (hēi) black plus 马 (mǎ) horse. Both languages settled on the same metaphor for a competitor nobody bet on who suddenly wins.
黑 — top 里 over 灬 (fire) — soot from flame
Originally a pictograph of a person whose face was blackened by smoke from a fire, with the lower 灬 representing flames and the upper part showing soot stains. Over time the form was regularized into the modern shape, and the meaning broadened from 'soot-blackened' to the general color black.
马 — pictograph of a horse (simplified from 馬)
马 is a pictograph that originally depicted a horse in profile, with mane, legs, and tail clearly visible in the oracle bone and bronze script forms. The traditional form 馬 still preserves four dots representing the legs. The modern simplified form 马 streamlines these strokes but retains the same meaning: horse.