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have a vested interest in sth
vested interest 指因个人利益而固定下来的利害关系；常用 have a vested interest in 表示“在…中有切身利益”。
She has a vested interest in the success of the project.
她在该项目的成功中拥有既得利益。
既得的；既定的；法定的
先理解核心含义，再看它在真实句子里的用法。
既得的；既定的；法定的
fixed and absolute, not dependent on any contingency
She has a vested interest in the success of the project.
她在该项目的成功中拥有既得利益。
既定的、固定的或绝对的,没有偶然性。
Settled, fixed or absolute, with no contingencies.
穿着衣服的,尤指穿着祭服的。
Dressed or clothed, especially in vestments.
After six years at the company, employees gain vested rights to their retirement fund.
在这家公司工作六年后，员工获得对其退休基金的既得权利。
She has a vested interest in the family farm and cannot be forced to give it up.
她对家族农场拥有既得权益，不能被强迫放弃。
The startup's employees waited four years to receive their vested shares.
这家初创公司的员工等了四年才拿到他们既得的股份。
vested interest 指因个人利益而固定下来的利害关系；常用 have a vested interest in 表示“在…中有切身利益”。
She has a vested interest in the success of the project.
她在该项目的成功中拥有既得利益。
become fully vested 主要用于养老金、股权等语境，表示权益已固定、不可被剥夺。此处 vested 是形容词，意为“既得的、已确定的”。
After five years of service, employees become fully vested in the retirement plan.
工作满五年后，员工在退休计划中的权益将完全归属。
Not this
The new policy may hurt the invested interests of large corporations.
Use this
The new policy may hurt the vested interests of large corporations.
表示“既得利益”时，固定的说法是 vested interests；invested interests 会被理解为“被投资的利益”，不符合原意。这两个词词形相近但分工不同，应区分。
Not this
The legal right is vested to the trust, so the beneficiaries are protected.
Use this
The legal right is vested in the trust, so the beneficiaries are protected.
vested in 是固定搭配，表示“（权利等）归属于/授予给某人或某机构”；用介词 to 不符合动词 vest 的搭配要求。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
既得利益
The reform was blocked by vested interests.
这项改革受到了既得利益集团的阻挠。
既得权利
Employees have a vested right to their accrued leave.
员工对其累积的假期享有既得权利。
完全既得的（权益）
She is fully vested in the company's pension plan.
她在公司的养老金计划中已完全享有既得权益。
法定既得的
Once the permit is issued, the developer's rights become legally vested.
一旦许可证签发，开发者的权利即成为法定既得权利。
授予；归属于
The power to appoint judges is vested in the president.
任命法官的权力归属于总统。
既得利益
Vested interests are preventing the new policy from being passed.
既得利益集团正在阻挠新政策的通过。
既得权利
After a decade of service, she has a vested right to the full pension.
工作十年后，她享有全额养老金的既得权利。
Use vested naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：穿上背心(vest)把利益护住不放，就是‘既得的、既定的’利益。
语域：formal 常见场景：法律文件、商务合同、正式学术写作 vested 在法律、商业等正式语境中通常修饰权利、利益等，表示“既得的”或“法定的”。日常口语中很少使用，多出现在合同、法规或正式文件中。
以下词语都与 vested /ˈvɛstɪd/ 押韵：rested /ˈrɛstɪd/、tested /ˈtɛstɪd/、crested /ˈkrɛstɪd/、nested /ˈnɛstɪd/、arrested /əˈrɛstɪd/、infested /ɪnˈfɛstɪd/，它们从重读元音开始都是 /ɛstɪd/。注意拼写相似的 wasted /ˈweɪstɪd/ 读 /eɪ/，并不押韵；vest /vɛst/ 也不带词尾 /ɪd/。
Dictionary facts from ECDICT, WIKTIONARY.