Source : Webster's Revised Unabridged Dictionary (1913)

Impound \Im*pound"\, v. t. [imp. & p. p. {Impounded}; p. pr. &
   vb. n. {Impounding}.]
   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.

         But taken and impounded as a stray, The king of Scots.
                                                  --Shak.

Source : WordNet®

impound
     v 1: 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" [syn: {attach}, {sequester},
           {confiscate}, {seize}]
     2: place or shut up in a pound; "pound the cows so they don't
        stray" [syn: {pound}]