Tā méijiǎo wēiwēi yī yáng, xiǎnchū bùyuè de shénsè.
She raised the corner of her eyebrow slightly, showing displeasure.
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In Taiwan Mandarin, 眉角 is borrowed from Taiwanese (bâi-kak) and means knack / unspoken know-how - like saying there is a trick to it. In mainland usage it usually keeps the literal meaning of eyebrow corner / facial expression.