lifeboat

a large boat that is kept ready to go out and save people who are in danger in the water

a small boat kept on a ship for people to leave in if the ship is not safe or might sink

a large boat that is kept ready to take out to sea and save people who are in danger, or a smaller boat kept on a ship for people to leave in if the ship is not safe or might sink

something such as money or a plan that will help people or organizations who risk failing, losing all their money, etc.:

Examples: