Sentence:  It is , I am reliably given to understand , the technical argot for those who engage in your particular branch of the boost ; i.e. , burglars who rob while the tenants are absent , in contrast to hot slough <WSD>prowlers</WSD> , those who work while the occupants are home . 
Meaning of the word marked with <WSD> tags:  someone who prowls or sneaks about; usually with unlawful intentions