Devolve upon
Definition 1 of 2
Pro Tip 1/3Duty Transfer
Used when someone becomes responsible because another person is absent or incapacitated. 
When the teacher is away, classroom control will devolve upon the designated student leader.
Pro Tip 2/3Succession
Indicates a fallback plan where control or duties default to a second-in-command. 
Should the captain be unable to serve, command will devolve upon the first officer.
Pro Tip 3/3Organizational Structure
Highlights structured delegation within a company or group. 
In the CEO's absence, decision-making powers will devolve upon the executive team.