ㄋㄨˋㄒㄧㄥˊxíngˊㄙㄜˋ

  1. 內心憤怒顯現臉上·洪邁··子夏》:子夏怒形於色。」東周列國·第一》:曹沬右手按劍左手怒形於色。」

to betray anger (idiom)​; fury written across one's face