1) Ship type 
Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with concealed weaponry, designed to lure submarines into making surface attacks. This gave Q-ships the chance to open fire and sink them. The basic ethos of every Q-ship was to be a wolf in sheep`s clothing. They were used by....
See decoy ship.
an armed combat ship disguised as a merchant vessel to attract submarines within attack range. Also called