1. Rob, rifle, sack refer to seizing possessions that belong to others. Rob is the general word for taking possessions by unlawful force or violence: to rob a bank, a house, a train. A term with a more restricted meaning is rifle, to make a thorough search for what is valuable or worthwhile, usually within a small space: to rifle a safe. On the other hand, sack is a term for robbery on a huge scale during war; it suggests destruction accompanying pillage, and often includes the indiscriminate massacre of civilians: to sack a town or district. 2. defraud, cheat.