A more thorough explanation:

Definition: A person who is responsible for guarding or keeping something or someone safe.

Example: The security guard at the museum is a gardein who ensures that the valuable artifacts are protected from theft or damage.

Explanation: The example illustrates the definition of gardein as a person who is responsible for guarding or keeping something safe. In this case, the security guard is the gardein who is responsible for protecting the valuable artifacts in the museum from theft or damage.