verb

• (transitive) To render larger, more extended, or more intense.
• (transitive, rhetorical) To enlarge by addition or commenting; to treat copiously by adding particulars, illustrations, etc.; to expand.
• (transitive) To increase the amplitude of something, especially of an electric current.
• (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.