そ知らぬ顔 (feigned ignorance)
idiom1 sentence
The set phrase そ知らぬ顔 (also 素知らぬ顔), literally 'unknowing face,' meaning 'a feigned look of ignorance, a poker face, a deliberately innocent expression.' Used when someone pretends not to notice or know something. 知らぬ is the classical negative attributive of 知る.
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