(~s)
1.
An ~ is someone who takes harmful drugs and cannot stop taking them.
He’s only 24 years old and a drug ~.
N-COUNT: oft supp N
2.
If you say that someone is an ~, you mean that they like a particular activity very much and spend as much time doing it as they can.
She is a TV ~ and watches as much as she can.
N-COUNT: usu supp N