the.com/side

means One of two or more surfaces, positions, or factions set in relation to a center, a line, or each other.

from From Old English 'side,' meaning the flank of a body or the slope of a hill, traced back to a Germanic root meaning 'long' or 'extended' — the same ancestor that gives related Germanic languages their words for a stretched, lateral expanse. The body sense came first: your side is the long surface between your front and back. Everything else — sides of an argument, a record, a road — is that same flank, borrowed outward.