знает кошка, чьё мясо съела(англ. эквивалент предложен пользователем натрикс; meaning: people who know they have done wrong reveal their guilt by the things they say or the way they interpret what other people say Karabas)
чует кошка, чьё мясо съела(If you have done something wrong and feel guilty about it, you will be uncomfortable and want to confess even if no one accuses you of wrongdoing. SirReal)