Linked up is a common phrase used to denote a connection or association between two or more things. However, there are several synonyms that can be used to convey the same meaning. Phrases such as connected, attached, joined, bonded, and united all refer to a relationship or connection between things. Additionally, terms like integrated, blended, merged, and consolidated signify the joining of separate entities into one cohesive unit. Synonyms such as correlated, related, and associated convey a sense of interdependence or mutual influence. Overall, there are numerous ways to express the idea of linked up, depending on the specific context and desired connotations.