Интересно, слетит ли он с катушек еще раз?
I wonder if this is a set expression with the meaning of:
I wonder if he will go out of his mind and fly away once again.
asked Jun 16 '18 at 8:03
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2The corresponding English expression is "fly off the handle". There's nothing about "flying away" there, otherwise your translation is quite adequate. – Headcrab Jun 18 '18 at 3:15
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I believe the image is taken from a process of lifting hewvy weights by industrial cranes, rolling some wires over the spindle wheels. If the wire started to unroll over the wheel side - then the weight would uncontrollsbly fly down, potentially breaking the crane and everything below – Arioch Jun 22 '18 at 23:31
Слететь с катушек is equal to "go crazy /mad, to lose control, to behave inadequately."
Иван совсем с катушек слетел, ругается дебоширит. Дай бог ему здоровья и не слететь с катушек. Можно было сразу слететь с катушек, это был удар по нервной системе.
"Слетит ли он с катушек" is translated as "if he will go out of his mind" So, the correct translation will be "I wonder if he will go out of his mind once again".
