(military) A guided missile that is designed for use against ships and large boats.

plural of anti-ship missile

(nautical) A person's duty in the navy is first to the ship, then to shipmates, and finally to himself/herself.

plural of line of battle ship

(idiomatic) To either improve one's behavior or else be required to leave; to either improve one's performance in an activity or else withdraw from that activity completely.

Alternative form of spoil the ship for a ha'p'orth of tar

Saying too much or releasing confidential information can have dangerous consequences.

(idiomatic) When one makes a significant amount of money. / (idiomatic) When one is successful

Alternative form of that ship has sailed

To have something important fail for want of a small amount of money or effort.