If something constricts you, it limits your actions so that you cannot do what you want to do. She objects to the tests the Government's advisers have devised because they constrict her teaching style = limit
If a part of your body, especially your throat, is constricted or if it constricts, something causes it to become narrower. Severe migraine can be treated with a drug which constricts the blood vessels My throat constricted, so that I had to concentrate on breathing