A "sunset provision" is a term referring to a clause in a contract or law that specifies that the agreement or legislation will expire after a certain period of time, unless it is renewed or extended. Other terms that can be used as synonyms for a sunset provision include "expiration date," "termination clause," or "time limit." A sunset provision can be an effective tool for ensuring that laws or contracts remain relevant and effective in changing circumstances. It can also provide a built-in opportunity for review and reevaluation of the agreement or legislation. Ultimately, the use of a sunset provision depends on the specific circumstances and goals of the parties involved.