'idolize' originates from Greek, specifically the word 'eidolon', where 'eidolon' meant 'image' or 'idol'. The Modern English verb formed with the suffix '-ize' (from French/Latin formation patterns).

'idolize' changed from Late Latin or Medieval Latin 'idolum' and Middle French 'idoliser' and eventually became the modern English 'idolize' in the late 16th century.

Initially it meant 'to make or treat as an idol' (more literal, tied to images or idols); over time it broadened to mean 'to regard with excessive admiration or adoration; to idealize'.