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.
rob (someone) blind
To rob in an unusually deceitful or thorough way: robbed the old couple blind while employed as a companion.