1.
look on one's face; facial expression; grimace
The expression or look on someone's face, almost always used when the expression is intense, frightening, or distorted with emotion such as anger, fear, or desperation.
Usage
形相 is almost exclusively used for intense, dramatic, or frightening facial expressions. It is not used for neutral or pleasant expressions — use 表情 for general facial expressions. Common modifiers include 恐ろしい (terrifying), 鬼のような (demonic), 必死の (desperate), and 血走った (bloodshot).