To Amplify

1. (transitive) To render larger, more extended, or more intense.
2. (transitive, rhetorical) To enlarge by addition or commenting; to treat copiously by adding particulars, illustrations, etc.; to expand.
3. (transitive) To increase the amplitude of something, especially of an electric current.
4. (translation studies) To add content that is not present in the source text to the target text, usually to improve the fluency of the translation.