substantiate
🇺🇸
/səbˈstænʃieɪt/
🇬🇧
/səbˈstænʃieɪt/
To prove that something is true by giving proof or evidence.
The scientist substantiated his theory with clear experimental results.
科学者がはっきりとした実験結果で彼の理論を裏付けた。