(~s)
1.
If you describe a person or thing as a ~, you mean that they are being used to hide someone’s true purpose or intentions.
Was Colombo the emissary of Pope Paul, his ~ within the Commission?...
N-COUNT: usu sing, oft N for/of n disapproval
2.
A ~ is a computer virus which is inserted into a program or system and is designed to take effect after a particular period of time or a certain number of operations. (COMPUTING)
N-COUNT