1. to insert or enclose (text or a word) within parentheses
Usage: chiefly British spelling; American English typically uses 'parenthesize'
2. to make a remark or comment that is set apart from the main text or conversation, as if in parentheses
Usage: figurative use

Examples

• The editor decided to parenthesise the translator's note at the end of the sentence.
• She parenthesised her doubts about the proposal in a brief aside.
• When writing formal essays, remember to parenthesise supplementary information.
• The author parenthesised several historical references throughout the chapter.
• He parenthesised his personal opinion to keep the report objective.
• The citation was parenthesised according to MLA style guidelines.