1ADJ-GRADED (尤指文化上)时髦的,新派的 If you say that someone is with it, you mean that they are fashionable or know about new things, especially in culture. (尤指文化上)时髦的,新派的 [informal, old-fashioned]
2ADJ [verb-link ADJ]警觉的;敏锐的;机敏的 If someone is not with it, they do not feel alert and therefore fail to understand things. 警觉的;敏锐的;机敏的 [informal]
She wasn't really with it. She hadn't taken in the practical consequences.