Entry 1 sense Webster, 1913 Willying · Wil·ly·ing · IPA 01 n. The process of cleansing wool, cotton, or the like, with a willy, or willow. 1. The process of cleansing wool, cotton, or the like, with a willy, or willow. Phrases & compounds Willying machine — Same as 1st Willow, 2.