What is a ship that sails slowly. [Obs.] Halliwell. His rendezvous for his fleet, and for all slugs to come to, should be between Calais and Dover. Pepys called?

slug — A ship that sails slowly. [Obs.] Halliwell. His rendezvous for his fleet, and for all slugs to come to, should be between Calais and Dover. Pepys. (Webster's 1913.)

Sources