Sentence:  Behind dingy blind and curtain, in upper story and garret, <WSD>skulking</WSD> more or less under false names, false hair, false titles, false jewellery, and false histories, a colony of brigands lie in their first sleep. 
Meaning of the word marked with <WSD> tags:  To stay where one cannot be seen, conceal oneself (often in a cowardly way or with the intent of doing harm).