gloss

noun or transitive verb

n. an explanation of a difficult expression in a text

tr. v. (with over) to explain away

Synonyms: annotation, explanation, commentary
Antonyms: dullness, misinformation, confusion
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When giving a presentation on the symbolism in the novel, Millie glossed over the plot of the book.
Difficult poems often include a gloss to explain some of their significant and unique jargon chosen by the poet.
Iyanla Vanzant's Glossary for the Soul | The Oprah Winfrey Show | OWN