The phrase "in bed with" typically describes a close relationship or association with someone, particularly in a business or political context. Some synonyms for this phrase include "partnership", "collaboration", "cooperation", "alliance", "association", and "affiliation". These alternatives can convey a similar idea of working closely with someone, but may not have the negative connotations that "in bed with" can sometimes imply. Other related phrases can include "on the same page", "in cahoots with", or simply "working together". Ultimately, the specific synonym chosen will depend on the context and desired tone of the message being conveyed.