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血の気

color in one's face; hot blood

→ 血
phrase Rare #38,276
color in one's face; hot blood 血の気がない／血の気がない顔 means having no color in one's face or looking pale. 血の気が多い describes someone hot-blooded, impulsive, or quick-tempered.
JA: 驚いて、彼の顔から血の気が引いた。
EN: He was so startled that the color drained from his face.

彼は血の気のない唇をしていた。

His lips were bloodless.

運転手は血の気が多い

The driver has a hot temper.

— TAXi (1998)

彼女の顔には血の気がなかった。

There was no color in her face.