Sibling rivalry is a term used to describe the competition, jealousy and conflict that can arise between brothers and sisters. There are several synonyms for this phrase, including sibling conflict, sibling competition, sibling jealousy, sibling animosity, and sibling tension. All of these phrases describe the same phenomenon, but each has a slightly different connotation. Sibling conflict, for example, may imply more overt disagreements and arguments, whereas sibling jealousy may suggest feelings of envy and resentment towards one's sibling. Sibling tension may refer to a more general feeling of discomfort or unease around one's sibling, while sibling animosity implies a deep-seated dislike or hostility. Ultimately, the phrase used to describe sibling rivalry will depend on the specific context and nature of the relationship between the siblings involved.