流血 (liú xuè): เพื่อเลือดออก

When my younger brother was riding his bike, he accidentally fell, scraped a large patch of skin off his knee, and it kept bleeding.

Doctor, my gums always bleed when I brush my teeth lately—is it a vitamin deficiency?

During the war, many soldiers bled and sacrificed their lives on the battlefield; their sacrifice bought us today's peace.