1. （使）减小;（使）减弱;（使）降低
When something diminishes, or when something diminishes it, it becomes reduced in size, importance, or intensity.
e.g. The threat of nuclear war has diminished...
核战争的威胁已经减小了。
e.g. Federalism is intended to diminish the power of the central state...
联邦制旨在削弱中央政府的权力。
2. 贬低;轻视
If you diminish someone or something, you talk about them or treat them in a way that makes them appear less important than they really are.
diminish在线翻译
e.g. He never put her down or diminished her...
他从未奚落或贬低过她。
e.g. He could no longer cope; he relied on me, and felt diminished by it.
他再也无法承受，他依赖我，却因此觉得是受了轻贱。