The phrase "cut someone short" means to interrupt someone, usually while they are speaking. There are several synonyms for this phrase, including "curtail," "abbreviate," "truncate," and "abruptly end." Other synonyms could be "halt," "cease," "terminate," or "bring to a close." The phrase "shut down" can also be used in this context. Sometimes, people may use less formal language and say they "cut someone off" or "put a stop to" what the person was saying. Regardless of the wording used, cutting someone short can be seen as rude and disruptive to a conversation or presentation.