grievance
/ˈgriːvəns/noun
1- a real or imagined wrong or other cause for complaint or protest, especially unfair treatment委屈; 冤情：
failure to redress genuine grievances.
未能洗刷真正的冤情。
1.1
- an official statement of a complaint over something believed to be wrong or unfair投诉：
three pilots have filed grievances against the company.
三名飞行员对公司进行了投诉。
1.2
- a feeling of resentment over something believed to be wrong or unfair怨愤, 不满, 不平：
he was nursing a grievance.
他心里滋生着怨恨。
词源
Middle English （also in the sense 'injury'）： from Old French grevance, from grever 'to burden' （see GRIEVE1）.