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1. Next to. I parked my car alongside of yours. My dog sleeps alongside of me all night.
2. Together with. We've been neighbors for so long that our kids grew up alongside of each other.
3. In comparison to. When you consider these two options alongside of each other, one is clearly superior.
1. Beside, next to, as in Tom's canoe lay alongside of mine. [Late 1700s]
2. Together with, as in Her children played alongside of mine all summer long. [Late 1700s]
3. Compared to, as in My car doesn't look like much alongside of Dad's. [Colloquial; late 1800s]