intransitive verb
Definition: To develop a mark on the skin after an injury has healed.
Example: After the accident, he noticed that his arm had scarred.
noun
Definition: A mark that remains on the skin after a wound has healed, or a sign of past injury or damage, either physical or emotional.
Example: After the accident, he had a noticeable scar on his arm.
transitive verb
Definition: To cause a lasting mark or injury on the skin or surface, often as a result of a wound or damage.
Example: The accident scarred his arm, leaving a visible mark.