vested interest
noun
usu. in sing.
1- a personal stake or involvement in an undertaking or state of affairs, especially one with an expectation of financial gain既得利益：
banks have a vested interest in the growth of their customers.
银行在客户的成长中有既得利益。
1.1
- a person or group having such a personal stake or involvement既得利益者; 既得利益集团：
the problem is that the authorities are a vested interest.
问题是当局是既得利益者。
1.2
- Law an interest (usually in land or money held in trust) recognized as belonging to a particular person【律】既得利益。