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That's not what centrism means. It's not an immediate compromise between the two. It's acknowledging that not every single stance held by a political party is the correct one.
I can support background checks and other limitations on firearm purchases, and also not want open borders. We should be doing something about the excess of gun violence, and we should be doing something about the thousands of immigrants jumping our border.
The word "centrism" does kind of imply a mix, or "center", between two positions. I would phrase it that the word is used for basically anyone whose thinking doesn't fit neatly into the "left" or "right" category, though - including people who are just lazily mixing positions, and also people who are really thinking outside the box but just happen to agree with a couple positions from those ideologies.