The term 'rove furtively' can be summarized as 'prowling'. Prowling is the act of moving around stealthily, often with the intent to commit a crime. It is usually done in a secretive manner, so as not to be noticed or detected. Prowling is often associated with burglars and other criminals, as it allows them to move around undetected and gain access to places they would otherwise not be able to enter.