To kill someone over a trivial slight, such as an angry glance; describes a person who is extremely petty, vindictive, and prone to violent overreaction.
他生性暴躁，睚眦杀人，同事们都对他敬而远之。
He has a violent temper and is prone to killing over a mere angry glance, so his colleagues all keep a respectful distance from him.
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