From Longman Dictionary of Contemporary Englishnosebleednose‧bleed /ˈnəʊzbliːd $ ˈnoʊz-/ noun [countable] MIif you have a nosebleed, blood starts flowing from your nose
Examples from the Corpus
nosebleed• Others suddenly developed a nosebleed and became limp, pale and lethargic.• To avoid nosebleeds happening, try not to blow your nose too hard.• Fortunately a younger boy had a dramatic nosebleed which distracted his house-mates' attention and covered any remaining smears of blood.• For months on end she suffered frequent nosebleeds and nearly passed out on several occasions.• Gary and I both have come out of there with nosebleeds, and I ruptured my eardrums at least once. 