take temporary possession of as a security, by legal authority
The FBI seized the drugs. The customs agents impounded the illegal shipment. The police confiscated the stolen artwork.
source: WordNet 3.0
place or shut up in a pound
Pound the cows so they don't stray.
source: WordNet 3.0
To shut up or place in an inclosure called a pound; hence, to hold in the custody of a court; as, to impound stray cattle; to impound a document for safe keeping.
