古英語のtord, dung, filthから、原ゲルマン語*turda, dirt, manureから、PIE*der, to separate, to tear apartから、語源的にはtear, tierと同じ。語彙の進化の比較shit, PIE*skei, to separateから、語源的にはscience, shedと同じ。
A tord ne yeue ic for eu alle ["The Owl and the Nightingale," c. 1250]
Alle thingis ... I deme as toordis, that I wynne Crist. [Wyclif, Phil. iii.8, 1382; KJV has "I count all things ... but dung, that I may win Christ"]