Fed is the past tense and past participle of feed .
N-COUNT
(美国安全局、联邦调查局、酒精、烟草与枪支管理局等)联邦机构工作人员
The feds are federal agents, for example of the American security agency, the FBI, or of the Bureau of Alcohol, Tobacco, and Firearms.
英英词典释义
Noun
1. any federal law-enforcement officer
2. the central bank of the United States; incorporates 12 Federal Reserve branch banks and all national banks and state charted commercial banks and some trust companies;
"the Fed seeks to control the United States economy by raising and lowering short-term interest rates and the money supply"