From Middle English quaschen, quasshen, cwessen, quassen, from Old French quasser, from Latin quassāre, under the influence of cassō (“to annul”), from Latin quatiō (“I shake”), from Proto-Indo-European *kʷeh₁t- (“to shake”) (same root for the English words: pasta, paste, pastiche, pastry). Cognate with Dutch kwetsen (“to hurt, injure”), German quetschen (“to crush, squash”), Spanish quejar (“to complain”).