Definition & Meaning of "all hands on deck"

What is the origin of the idiom "all hands on deck" and when to use it?

The phrase "all hands on deck" originated in the context of sailing ships. When a ship was in a crisis or an emergency, the captain would call for "all hands on deck," meaning that every member of the crew was needed to help. It is now used more broadly to mean that everyone is needed to help with a task or situation. It is often used in a work or business context.