To cheat. Let us bilk the rattling cove; let us cheat the hackney coachman of his fare. Cant. Bilking a coachman, a box-keeper, and a poor whore, were formerly, among men of the town, thought gallant actions.
TO BILK
Meaning of TO BILK in English
Slang English vocab. Английский сленговый словарь. 2012