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vested interest

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*vested interest (in something)

Fig. a personal or biased interest, often financial, in something. (*Typically: have ~; give someone ~.) Margaret has a vested interest in wanting her father to sell the family firm. She has shares in it and would make a large profit. Bob has a vested interest in keeping the village traffic-free. He has a summer home there.

See also: interest

vested interest

A personal stake in something, as in She has a vested interest in keeping the house in her name. This term, first recorded in 1818, uses vested in the sense of "established" or "secured."

See also: interest