amplify

To render larger, more extended, or more intense.

amplify the loudspeaker

amplify a telescope

To enlarge by addition or commenting; to treat copiously by adding particulars, illustrations, etc.; to expand.

Troilus and Cressida was written by a Lombard author, but much amplified by our English translator.

GCN asked Gill just who this law was aimed at. "Child abusers" he responded. He would not amplify on what he meant by child abusers.

To increase the amplitude of something, especially of an electric current.

amplify a signal

To add content that is not present in the source text to the target text, usually to improve the fluency of the translation.