WordWeb Online

1. (law) placing private property in the custody of an officer of the law
   - impoundment, internment, poundage

1. Take temporary possession of as a security, by legal authority
   "The customs agents impounded the illegal shipment";
   - attach, sequester, confiscate, seize, sequestrate
    
2. Place or shut up in a pound
   "impound the cows so they don't stray";
   - pound

Type of: confine, constrain, hold, restrain, seizure, take

Encyclopedia: Impound