Surreptitious movement is a term used to describe a type of movement that is done in a secretive or stealthy manner. It is often used to refer to the act of moving around without being noticed or detected. The term can also be used to describe a type of behavior that is done in a clandestine way, such as espionage or smuggling. The crossword solution for this term is STEALTH, which is defined as the act of moving or acting in a way that is not easily seen or detected.