noun Download 🔗Share One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft. Examples : "The farmer carefully attached the horse to the wagon's thills. " vehicle machine part Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The shallow stratum of underclay that lies under a seam of coal; the bottom of a coal-seam. Examples : "The miners carefully scraped away the last of the coal seam, being cautious not to damage the soft thills underneath. " geology material substance industry Chat with AIVocabulary GamePractice Reading