im ‧ pound /ɪmˈpaʊnd/ BrE AmE verb [transitive] law
[ Date: 1400-1500 ; Origin: ⇨ ↑ pound 1 (2) ]
if the police or law courts impound something you have or own, they keep it until it has been decided that you can have it back SYN confiscate :
He sued the police after they impounded his car.