"Register with" is a commonly used term, but at times, we may want to use its synonyms to convey a different tone or meaning. Some synonyms for "register with" include "sign up," "enroll," "join," "subscribe," "become a member," "tick off," and "record." Each term has a unique connotation that determines its actual usage. For instance, "sign up" is commonly used in the context of enrolling in a course or joining a new website or online platform. "Record" is used in the context of taking note of something that has happened or needs to be kept track of, such as an attendance register. Choosing the right synonym can help to add variety to your language and make your writing more engaging.