眉に唾をつける、眉につばをつける、眉に唾を付ける
まゆにつばをつける
mayunitsubawotsukeru
JMdict entry #2670370
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expressions (phrases, clauses, etc.)Ichidan verb
idiomatic expression
to keep one's wits about one; to be on one's guard; to be wary of trickery
see: 眉唾物・まゆつばもの