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| English | Russian |
| it takes one to know one | судим по себе (used for saying that someone must have a bad quality themselves if they can recognize it in other people : ‘He's a complete idiot!' ‘Well, it takes one to know one!' Leonid Dzhepko) |
| know what's what | знать все ходы и выходы (Leonid Dzhepko) |
| one doesn't know where to look next | глаза разбежались (Leonid Dzhepko) |
| one never knows | не ровён час (Leonid Dzhepko) |
| you never know what might happen | не ровён час (Leonid Dzhepko) |