The phrase "in with it" can be used to describe being up-to-date or knowledgeable about something. Some synonyms for this phrase include "in the loop," "well-informed," "in the know," "on top of things," and "clued in." These phrases can be used interchangeably depending on the context. For example, if someone is discussing important news with a group of colleagues, they might say "I want to make sure everyone is in the loop about this situation," or "I'm confident that everyone here is well-informed about the latest developments." These synonyms can be helpful in making sure everyone stays informed and on the same page.