thrice-driven

p. a. thrice-winnowed,thrice-sifted (toobtain the smallest feathers),softest possible （为了挑出最小的羽毛而）筛选过一次的，最柔软的。
△ Oth. 1. 3. 230(229): “The tyrant custom,most grave senators,Hath made the flinty and steel couch of war / My thrice-driven bed of down. ” (Proverb:“ Custommakes all things easy.”)各位庄严的元老，习惯的暴力早已使我把战场上的砂石和刀枪当做最细软的绒毛床褥。