What does “с ума сошли” mean in Russian?
Китайка попала в хоровод детей
A1 Russian listening practice · Standard Russian · Picked for people who know a little
Сойти с ума means “to go mad,” built from сойти, “to step down / off,” and ум, “mind”: you step off your mind. People say it all the time, not only about real madness: вы что, с ума сошли? is “have you lost your mind?”, and с ума сойти! on its own is an amazed “unbelievable!” or “wow!”
The past form follows gender and number: он сошёл с ума, она сошла с ума, вы сошли с ума. Related: сводить с ума, “to drive someone crazy,” including with love. In the cartoon, a circle of kids (хоровод) traps a toddler, and the rescuer bursts in with вы что, с ума сошли, что ли?
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Source: wordfreq 3.1.1 (general) · OpenSubtitles 2018 (HermitDave) (spoken). These numbers are close, not perfect.