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выживший из ума stresses
gen.	drivelling; cracked; dotard; balmy on the crumpet; dotted; senile (Olya34)
Gruzovik	crazy
contempt.	anile
inf.	gaga; crack-brained; cracked (о рассудке); loonie (Val_Ships)
slang	cracked; chicken oriental (Interex); ga-ga
выжить из ума
gen.	lose possession of one’s faculties; be mad as a March hare; lose marbles (Anglophile); take leave of senses (Anglophile); lose possession of one's faculties (Anglophile); become senile (Anglophile); go gaga (Anglophile); rave loonies (Buddy89); dote (bigmaxus); be cracked; lose possession of faculties; be as mad as a March hare; be cracked; go senile (Olya34)
idiom.	lose ones marbles (Yeldar Azanbayev); out of tree (yuliyagrinenko)
inf.	be in one's dotage (igisheva); lapse into dotage (igisheva); sink into dotage (igisheva)
irish.lang.	be gets (ad_notam); be gets (ad_notam)
Makarov.	be as mad as a March hare

выживший из ума: 16 phrases in 6 subjects

American usage, not spelling	1
Figure of speech	1
General	10
Informal	1
Makarov	2
Slang	1