Dic: bleed someone white, bleed someone dry

• The creeps tried to bleed me white.
• Richard got a picture of Fred and Joan together and tried to bleed both of them dry by threatening to show it to their spouses.
• I'm worried that the medical bills will bleed my parents dry.

to take someone's money until most or all of it has gone.

... http://idioms.thefreedictionary.com/bleed