Pronunciation: (twēk),[key] —v.t. 1. to pinch and pull with a jerk and twist: to tweak someone's ear; to tweak someone's nose. 2. to pull or pinch the nose of, esp. gently: He tweaked the baby on greeting. 3. to make a minor adjustment to: to tweak a computer program.
—n. an act or instance of tweaking; a sharp, twisting pull or jerk.