DICT.TW Dictionary Taiwan

 Sound, n.  Geog. A narrow passage of water, or a strait between the mainland and an island; also, a strait connecting two seas, or connecting a sea or lake with the ocean; as, the Sound between the Baltic and the german Ocean; Long Island Sound.
    The Sound of Denmark, where ships pay toll.   --Camden.
 Sound dues, tolls formerly imposed by Denmark on vessels passing through the Baltic Sound.