When the new law was proposed, we began hearing arguments from both the 'pros' and the cons. [=from the people who supported it and the people who opposed it]
Congress weighed the 'pros and cons' of the new tax plan. [=the arguments for and against the new tax plan]
The governor has taken a 'pro-choice' position. = The governor is 'pro-choice'.
(..) - What do ya mean? - What, are you crazy? You think they're just gonna let this guy slip outta their hands? He's got another year in college, and then maybe the pros. He did it for me. He won't do it again. Don't kid yourself. Once you ain't a virgin no more, you're a whore. (..)1974 The Gambler