Definition of "betraying" []

• Present participle of betray. (verb)

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• "Her expression betraying nothing, Chen asked, “Sir, did you know you have a green stain on your pants?”"
• "A “clean wound,” as the doctor in the emergency room would later say, his expression betraying no awareness of the irony inherent in such a description."
• "Redmond pushed open the door and went inside, his expression betraying nothing."