If I understand correctly, when you have "pared gains" it is because you have holdings in various sectors, some winning some lossing, but overall your portfolio is ahead. You gain's have been pared by your losses. Pared losses would be the same, scenario but switch it to overall loss.
Another way to "pare" your gains, if for instance in the heavy bear market rally previous to last week, I bought FAS, then sold it, then realized it was still climbing and bought it again, sold it again because I thought it was going to continue dropping but ended up buying it again because it kept going.
In that case I pared my gains, because I cut into my own profits by not riding it the whole way up. The paring of the gains in this case was extra commisions, and missed growth while I skipped some pennies or dollars on the way up.
I don't know if my example is the right use of the colloquil term - "pared gains", but at least it's grammatically correctly.