Bing (5,990,000 Results): https://idioms.thefreedictionary.com/rob+blind (Rob blind - Idioms by The Free Dictionary) -- rob someone blind 1. Fig. to steal freely from someone. Her maid was robbing her blind. I don't want them to rob me blind. Keep an eye on them. 2. Fig. to overcharge someone. You are trying to rob me blind. I won't pay it! Those auto repair shops can rob you blind if you don't watch out. See also: blind, rob 
