Longman Dictionary of Contemporary English - itch

~1 v 1 if part of your body or your clothes itch, you have an unpleasant feeling on your skin that makes you want to rub it with your nails  (My feet were itching terribly. | itch sb AmE)  (The label on this shirt itches me.) 2 be itching to do sth informal to want to do something very much as soon as possible  (You could tell they were itching to leave.) ~2 n 1 an uncomfortable feeling on your skin that makes you want to rub it with your nails 2 informal a strong desire to do or have something + for  (an itch for adventure)