1. have a need/hope to get even, or get even with someone for a past wrong or grievance
Professional
Social
have a score to settle with someone who wronged you
If you have ‘a score to settle’ it means you have a past grievance or loss to discuss, get even on or put right with someone. When someone let you down or did something harmful or hurtful to you in the past which you then keep in mind in order to do something bad to them in return you have 'a score to settle'. This idiomatic expression has a negative connotation in that it implies seeking revenge for past wrongdoings