proponent
🇺🇸
/prəˈpəʊnənt/
🇬🇧
/prəˈpəʊnənt/
someone who strongly supports or argues for a particular idea or way of doing something
The proponent of the new policy gave a persuasive speech at the meeting.
新政策的支持者在会议上发表了有说服力的演讲。