establish one's credentials
成語所屬單字credentials
establish one's credentials — 慣用語
1. to prove that you have the necessary skills, experience, or personal qualities f
1.慣用語
釋義
證明自己的能力（或資格）
to prove that you have the necessary skills, experience, or personal qualities for a particular role or task
例句
By volunteering at the refugee centre, Gabriel quickly established his credentials as a trusted organiser in the community.
The new coach needs to establish his credentials with the players before he can demand their full dedication.