1. acting as a deputy or substitute for someone, especially in an official capacity
Usage: present participle of 'deputise'; chiefly British English; American English typically uses 'deputizing'

Examples

• The vice principal is deputising for the headmaster while he is on leave.
• She has been deputising as team leader for the past month.
• The ambassador was deputising for the secretary of state at the conference.
• He is deputising in the role until a permanent replacement is found.
• The manager asked her to deputise for him during the meeting.
• Several staff members took turns deputising for the absent director.