The term sori (kanji: 反り) means "curve" in English. It is written そり in hiragana. It's pronounced roughly like "soh-ree".
On its own, 反り is pronounced sori and can mean a curve, a bend, a warp in a board, or the arch in a bridge. It becomes zori when prefixed by another word due to the linguistic phenomenon called sequential voicing.
Sori ga awanai (反りが合わない, literally “the curve does not fit”) is a figure of speech, taken from the fit of a sword and its sheath, that people may use to express how they cannot get along or “hit it off” with another.