off one's rocker

a nutcase all shapes and sizes bananas barmy batshit batty be a couple of sandwiches short of a picnic be as mad as a March hare be as mad as a hatter be as nutty as a fruitcake be away with the fairies be barking mad be losing it be not all there be not right in the head

الطب النفسي وعلم النفس والأمراض العقلية