with one's eyes flashing; with a fierce glare
A literary set phrase describing an intense, determined, or angry expression where the eyes are wide open and glaring. Often used in dramatic or narrative contexts.
He glared at his enemy with flashing eyes.
Mixed kanji-kana spelling; the first part is written in kana.
From 眦を決する, literally “to set the corners of one’s eyes,” describing the eyes becoming sharply fixed in determination or anger.