IPA: /ˌɛdɪˈtɔːrɪəlaɪz/
KK: /ˌɛdɪˈtɔːrɪəlaɪz/
To express a personal opinion or viewpoint, often in a way that resembles an editorial article.
The journalist decided to editorialize about the recent political events in her column.
Editorialize → It is formed from "editor" (from Latin "editor", meaning one who puts forth or publishes) and "-ialize" (from Latin "-izare", meaning to make or to cause to be). The word "editorialize" means to express opinions or interpretations in a manner characteristic of an editor, essentially making something into an editorial.
Think of an 'editor' who 'makes' ('-ialize') something into an opinion piece — that's why editorialize means to express opinions.