1. to worry intensely or suffer mentally about something
Usage: British spelling (American: agonize); often followed by 'over' or 'about'
2. to cause severe physical or mental pain to someone
Usage: less common in modern usage

Examples

• She agonised over the decision for weeks before accepting the job offer.
• He agonised about whether he had made the right choice.
• Don't agonise so much—just do your best and let it go.
• The team agonised over every detail of the proposal.
• Parents often agonise about their children's future.
• I agonised about the exam results until they finally arrived.