The term 'made certain' can be expressed in three different ways: ensured, INSURED, and sawtoit. To ensure something is to make sure that it happens or is done properly. To insure something is to protect it from loss or damage by providing financial compensation. Sawtoit is an old-fashioned term meaning to take care of something or to make sure it is done properly. All three terms can be used to describe the act of making something certain.