A rivalry is when two people or groups are competing with each other, often in a friendly way.
When we talk about a rivalry, we're usually thinking about teams or individuals who are facing off against each other in sports. But rivalries can also happen between countries, companies, or even just friends trying to one-up each other. For example, if two football teams have been competing for years and always seem to come close to winning the championship, their rivalry is what makes those matches so exciting.
An ongoing relationship between (usually two) rivals who compete for superiority.
Example: The Boston Bruins have a longstanding rivalry with the Montreal Canadiens.
