the.com/open wound

means An injury where the skin is broken and the tissue underneath is exposed, often bleeding — as opposed to a bruise or closed trauma where the skin stays intact.

from 'Open' traces back through Old English 'open' to a Germanic root meaning 'raised' or 'lifted up,' the idea being a lid or barrier lifted away so what's inside becomes visible — exactly what a torn-open gash does to skin. 'Wound' comes from Old English 'wund,' a very old Germanic word for an injury or hurt, related to a root meaning 'to beat or strike.' The phrase itself isn't a special coinage, just plain medical description — it's 'open' as opposed to a 'closed' wound, the distinction doctors have drawn for centuries between damage you can see into and damage hidden beneath intact skin.