noun🔗ShareOne of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft."The farmer carefully attached the horse to the wagon's thills. "vehiclemachinepartChat with AIVocabulary GamePractice Reading
noun🔗ShareThe shallow stratum of underclay that lies under a seam of coal; the bottom of a coal-seam."The miners carefully scraped away the last of the coal seam, being cautious not to damage the soft thills underneath. "geologymaterialsubstanceindustryChat with AIVocabulary GamePractice Reading
