intransitive verb
Definition: To develop a dark mark on the skin caused by an injury, often without breaking the skin.
Example: After falling off his bike, he started to bruise on his arm.
noun
Definition: An injury to the skin or underlying tissues that causes discoloration but does not break the skin, often due to a bump or impact.
Example: After falling off his bike, he had a large bruise on his arm.
transitive verb
Definition: To cause a mark or injury on the skin or flesh by hitting or pressing it, usually without breaking the skin.
Example: He accidentally bruised his arm when he bumped into the door.