The colloquial term "nick off" has many alternative synonyms that can be used in conversation or writing. Some of these synonyms include "buzz off," "bugger off," "beat it," "go away," and "shove off." These phrases are often used to politely or firmly tell someone to leave or stop bothering someone else. Depending on the context, the intensity of the phrase can vary, ranging from a friendly request to a harsh demand. However, it is important to note that some of these phrases can be considered rude or impolite in certain situations and should be used with caution.