in secrecy
1. 秘密地
The operation was conducted in secrecy.
这一行动是秘密进行的。
swear to secrecy
1. (使某人)发誓保密
I have been sworn to secrecy about it.
他们让我发誓对这事保密。
习惯用语in [with] secrecy1.秘密地, 暗中in the secrecy of one's own heart1.在内心深处swear sb. to secrecy1.使某人发誓保密with the utmost secrecy1.极秘密地