living proof (uncountable)
- (idiomatic) A real-life person or thing which demonstrates the validity of a hypothesis.
His story is living proof that anyone who puts in a good amount of hard work can find success.
2020, Christine Chiou, “How Taiwan Battles the Coronavirus”, in The Diplomat[1]:Taiwan is not only a beacon of democracy, but also living proof that control of an emerging virus can be achieved through science, technology, and democratic governance. No draconian autocratic measures are required.
real-life person or thing which demonstrates the validity of a hypothesis