ultimate responsibility

noun phrase

1. The highest or final level of responsibility for a person, decision, or outcome; the person or organization with ultimate responsibility is fully accountable, even if tasks are delegated to others.

   B2

   usually uncountable; responsibility for something

   • "The manager has ultimate responsibility for the team's performance."B1
   • "Although several people worked on the project, the director retained ultimate responsibility for its success."B2
   • "The board accepts ultimate responsibility for ensuring that the organization complies with the law."C1