Bruise

To injure, as by a blow or collision, without laceration; to contuse; as, to bruise one's finger with a hammer; to bruise the bark of a tree with a stone; to bruise an apple by letting it fall.

To break; as in a mortar; to bray, as minerals, roots, etc.; to crush.

To fight with the fists; to box.

An injury to the flesh of animals, or to plants, fruit, etc., with a blunt or heavy instrument, or by collision with some other body; a contusion; as, a bruise on the head; bruises on fruit.

an injury that doesn't break the skin but results in some discoloration