ombudsman
noun [ C ] uk/ˈɒm.bʊdz.mən/ us/ˈɑːm.bədz.mən/ -men uk/-mən/ us
（政府或大型机构处理投诉的）民情调查官，巡视官，申诉专员
someone who works for a government or large organization and deals with the complaints made against it
Complaints to the Banking Ombudsman grew by 50 percent last year. 去年，银行业意见调查员接到的投诉增加了50%。