Self-closing is a term that refers to a mechanism that automatically closes something, such as a door or a valve, after being opened. However, there are several synonyms that can be used to describe this type of mechanism. Some of these include automatic closure, spring-loaded, and shutting mechanism. Additionally, self-latching, self-sealing, and automatic locking are other synonyms that can be used to describe a self-closing mechanism. These terms are often used in the design and manufacturing of various products, particularly in the construction and engineering industries. In summary, there are several effective synonyms for the term self-closing that can be used to describe the same type of mechanism.