OPT OUT is a term used to describe the act of withdrawing from an agreement or situation. It is often used in the context of opting out of a contract, such as a job or a subscription. It can also be used to refer to the decision to not participate in an activity or event. The term PASS, which is a four letter word, is related to this concept in that it is used to describe the act of allowing someone else to take one's place in a situation.