Sentence:  It is , I am reliably given to understand , the technical argot for those who <WSD>engage</WSD> in your particular branch of the boost ; i.e. , burglars who rob while the tenants are absent , in contrast to hot slough prowlers , those who work while the occupants are home . 
Meaning of the word marked with <WSD> tags:  carry out or participate in an activity; be involved in