1. To go astray in thought or belief; to be mistaken; to be incorrect: Sonia erred in her thinking that her shopping was completed.
2. To go adrift morally; to sin: The reverend cautioned his congregation not to err in their daily behavior.
3. To drift off from the true course, aim, or purpose: The captain erred when he directed the ship to sail south instead of east to the island.
4. To wander from the right direction; to lose the way from the true course or purpose: Despite her promise to stop smoking, Laura was erring from time to time and sneaked some smokes.
5. To miss the right way, in morals or religion: There was an emphasis at the religious college that students should not err in their commitment to their faith and that they should live morally.
6. To deviate from the path or line of duty: The soldier erred in achieving his responsibility as indicated by his superior officer.
7. To stray by design or mistake: During the drive to the city, William noticed that he was erring by taking the wrong road.
8. To make a mistake; to commit an error: The members of the group erred in their estimate of how long it would take to complete the project.
9. To do wrong from ignorance or inattention: The child erred in her chores because she was distracted by playing with her puppy.
10. To wander; to ramble: Jacob enjoys erring in old cities, admiring the narrow streets and interesting shops.