all there
all here
Understanding well; thinking clearly; not crazy. Usually used in negative sentences.
Joe acted queerly and talked wildly, so we thought he was not all there.
not all there
Not completely alert mentally; absentminded; not together.
Аналог выражения "не все дома"; быть странным.
Bill is a wonderful guy but he is just not all there.
My university teacher always wears a silly hat and carry an umbrella with him like he's not all here.
Мой преподаватель в университете всегда носит шляпу и зонт будто у него не все дома.