To compile a glossary or to provide a glossary for a text; to explain or annotate using glossary-like definitions.
From glossary plus -ize suffix (to make or do something), meaning to convert something into glossary form or to apply glossarial methods to a text.
When scholars 'glossarize' a difficult text, they're essentially creating a decoder ring—every hard word gets a quick explanation right at the bottom of the page.
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