Определение reserve clause в Английский Язык Английский Язык словарь
A clause formerly included in the contract of a professional athlete that allowed the automatic extension of the contract for a year beyond its expiration, thus binding the player to the organization until release, retirement, or a trade
a clause that used to be part of the contract with a professional athlete extending the contract for a year beyond its expiration; "the reserve clause was used to bind players to a particular ball club