I've seen "opt out" used in some places and "opt-out" in others. Both seem to be used in the same way - to remove one's self from something. I'm not able to find any official sources that suggest which is correct.
Which is proper?
I Googled for several variations of "opt out vs opt-out". I was unable to find any articles or pages that directly discussed the differences between the two. The search results all seemed to define one of the phrases or the other in very similar terms (the difference was still not clear).
I checked www.dictionary.com. I was only able to find a definition for "opt out", not a version for "opt-out". The definition I did find was similar to the definitions above.
I searched the English Language & Usage (this) site for the phrases "opt out" and "opt-out" but was unable to find a question that answered the above. The questions mostly seemed to compare "opt out" or "opt-out" to another similar word ("withdraw" for example).