The phrase "get off someone's case" is typically used to request a person to stop bothering or nagging someone. There are a few other phrases that could be used as synonyms in this situation. Some of the most common include "back off", "leave alone" and "let it go". Other phrases that may be used include "stop harping on", "take a break", and "give it a rest". Regardless of the phrase utilized, it is important to clearly communicate the request to stop, ensuring that the message is firmly and tactfully communicated.
