1. past tense of editorialise: to write or publish an editorial; to express an opinion in the manner of an editorial
Usage: British spelling (American: editorialized); often used in journalism and media contexts
2. to insert editorial comments or opinions into (a text, report, or account); to add subjective commentary to something that should be factual
Usage: often used critically to indicate bias or lack of objectivity

Examples

• The news anchor editorialised about the policy rather than simply reporting the facts.
• She editorialised in her column about the need for educational reform.
• The journalist editorialised the report, which compromised its objectivity.
• He editorialised throughout the documentary, making his political views clear.
• The editor editorialised the article before it went to print.
• Critics argued that the commentator editorialised too much during the broadcast.