羞于启齿 xiūyúqǐchǐ too shy to speak out Origin Definitions Defs Strokes Stroke Words Sentences Sents 羞 xiū adjective shy shy; bashful; to be embarrassed于 於 yú preposition in Indicates a location, scope, or time; equivalent to 在 zài启齿 啟齒 qǐchǐ to open one's mouth To open one's mouth to start talking; often used when having something difficult to say or when asking for a favor from someone.