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| English | Russian |
| not to have a brain in one's head | плохо соображать (Bobrovska) |
| not to have a brain in one's head | не иметь ничего в голове (Bobrovska) |
| not to have a brain in one's head | быть безмозглым (Bobrovska) |
| not to have got a brain in one's head | плохо соображать (Bobrovska) |
| not to have got a brain in one's head | не иметь ничего в голове (You haven't got a brain in your head! – Головы у вас на плечах нет, вот что! Bobrovska) |
| not to have got a brain in one's head | быть безмозглым (Bobrovska) |