If something is impounded by policemen, customs officers or other officials, they officially take possession of it because a law or rule has been broken.
例句
The ship was impounded under the terms of the UN trade embargo...該船因觸犯聯合國貿易禁運條款而被扣押。The police moved in, arrested him and impounded the cocaine.警察沖進去將他拘捕并沒收了可卡因。