grievance
/ˈgri:vns; `ɡrivəns/ n
~ (against sb) real or imagined cause for complaint or protest (used esp with the vs shown) 委屈, 苦衷, 牢骚, 不满, 怨恨（尤与下列示例中动词连用）
inviting the members to air (ie express) their grievances 请成员们诉说苦衷
He'd been harbouring/nursing a grievance against his boss. 他一直对老板心怀不满.
Management agreed to settle the workers' grievances. 资方同意处理工人的申诉.