I often hear the expression that someone “smells blood” and goes on the attack. I was wondering if this expression was a reference to sharks, specifically. Is it an old expression? Would it possibly predate whenever it is humans discovered sharks can smell blood.
It’s a curious expression since we normally cannot actually smell blood (apparently there are some medical conditions which does make a person’s blood smell certain ways)… And if we could smell blood we don’t have an instinct to attack the person bleeding.
I’m just curious where this expression came from and how old it is.