TV/Anime term.

One-sided rivalries is basically a term where two cartoon or anime characters have a rivalry, but when they battle (or compete or dance or whatever the case is), one person of the rivalry always defeats them in said battle.
Dan: You know what I've always noticed, Bob?
Bob: What, Dan?
Dan: That in that one anime-what's it called-Azumanga Daioh, Sakaki always wins against that other girl...Kagura I believe?
Bob: That's a one-sided rivalry, Dan.
Dan: So that's the term. And now I know.
Bob: And knowing is half the battle.
by Sciencemandance June 6, 2010
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