blockship
nounEtymology From block + ship.
1
Nautical, Transport A vessel that is deliberately sunk in order to block a waterway (to prevent it being used by an enemy)
- […] the veteran paddle-steamer Gondolier was sunk as a blockship at Scapa Flow; […].1946 September and October, “Notes and News: The War Effect on the Clyde Steamers”, in Railway Magazine, page 324: