Tā dāngmiàn duì xīn tóngshì hěn rèqíng, bèihòu què dàochù shuō huàihuà, zhēnshì xiàolǐ-cángdāo.
She's all warmth to the new colleague's face but bad-mouths her everywhere behind her back. A real dagger behind a smile.
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From the 《旧唐书》 biography of the Tang minister 李义府, who smiled at everyone while quietly ruining anyone who crossed him; people said he had a knife in his smile and nicknamed him "Li the Cat". It is also the tenth of the Thirty-Six Stratagems, 三十六计.
