IPA: /ˈkloʊzəbl/
KK: /ˈkloʊzəbl/
Able to be closed or shut.
The closet has a closable door that keeps the items inside safe.
Closable → It is formed from "close" (from Old French *clore*, meaning to shut or enclose) and "-able" (meaning capable of). The word "closable" means capable of being closed or shut.
Think of something that is 'capable of being shut' — 'close' means to shut, and '-able' indicates the ability to do so.