illustrateEnglishOxford American Thesaurusillustrate verb 1 the etchings and photographs that illustrate the book are gruesome: decorate, adorn, ornament, embellish, accompany; add pictures/drawings/sketches to, provide artwork for. 2 the complex interplay of such pressures can be illustrated through a brief example: explain, elucidate, clarify, make clear, make plain, demonstrate, point up, show, bring home, emphasize, interpret; describe, sum up, summarize, gloss; informal get across, get over. 3 he possessed a quicksilver wit, as illustrated by his remark to Lucy: exemplify, show, demonstrate, display, instance, encapsulate, represent; rare instantiate.