Itchy/ˈɪtʃi/ Definition 1 of 4Pro Tip 1/2Common Trigger Think of things that often cause itching, like wool or allergies, when you see 'itchy'. I need to take off this itchy scarf. Pro Tip 2/2Physical Sensation Itchy is used to describe something physical that causes an urge to scratch. This itchy rash is driving me crazy.