If you remain anonymous when you do something, you do not let people know that you were the person who did it.
近义词
unknown , unidentified , unnamed
双语例句
例： You can remain anonymous if you wish.
如果你愿意你可以保持匿名。
例： An anonymous benefactor stepped in to provide the prize money.
一位匿名捐助人施以援手提供了奖金。