n.
1.someone who is so ardently devoted to something that it resembles an addiction
2.someone who is physiologically dependent on a substance addict v.
1.to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
Idiom of the Day
walk off with (something)
to take something and go away with it, to steal something
I walked off with the wrong backpack by mistake.