also with-it
1.
If you say that someone is with it , you mean that they are fashionable or know about new things, especially in culture. ( INFORMAL, OLD-FASHIONED )
ADJ
2.
If someone is not with it , they do not feel alert and therefore fail to understand things. ( INFORMAL )
She wasn’t really with it. She hadn’t taken in the practical consequences.
ADJ : v-link ADJ , usu with brd-neg