What does jump ship mean?
Jump ship is an idiom that means “to leave a person, situation, or place, usually hurriedly and permanently” (e.g., “The CEO jumped ship to another company as soon as sales started to go down”).
Abandon ship is another way to phrase this idiom (e.g., “Come on. Don’t abandon ship at the first sign of difficulty in your relationship”).
Jump ship can also be used literally to refer to a sailor leaving the ship they are assigned to without permission. Abandon ship can be used literally to mean “escape from a sinking ship.”