Tā yòng yī gè yǎnshén jiù ràng háizi ānjìng xiàlái le.
He silenced the child with just one look.
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usage
眼神 refers to the expressive quality of someone's gaze, not just the physical eye. Common descriptions: 眼神犀利 (sharp gaze), 眼神温柔 (gentle gaze), 眼神交流 (eye contact).