Russian ⇄ English German

умом тронуться stresses
gen.	be out of mind (Andrey Truhachev); be out of senses (Andrey Truhachev)
idiom.	go gaga (losing one's head Val_Ships)
inf.	be off one's rocker (Andrey Truhachev); be off your rocker (Andrey Truhachev); have bats in the belfry (Andrey Truhachev); be not right in the head (Andrey Truhachev); be bats (Andrey Truhachev); be batty in the brain (Andrey Truhachev); have a screw loose (Andrey Truhachev); be crazy (Andrey Truhachev)

умом тронуться: 16 phrases in 6 subjects

General	2
Informal	9
Makarov	1
Proverb	1
Psychology	2
Slang	1