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to become frightened; to be frightened (of); to be scared (of)
幼い子供は大きな雷の音に怯えています。
The young child is frightened by the sound of thunder.
犬は大きな花火の音に怯えて隠れました。
The dog was scared of fireworks and hid.
彼女は怯えた目で私を見つめていました。
She was staring with frightened eyes.