Definition & Meaning of "[bay] for blood"

What is the origin of the idiom "bay for blood" and when to use it?

The idiom "bay for blood" likely finds its origin in the imagery of hunting hounds, particularly in traditional hunting practices involving packs of dogs pursuing game. When hounds are on the scent of prey, they often emit loud, baying sounds to signal their pursuit and excitement. This vocalization serves to rally the other hounds and alert the hunters to the presence of prey. It is often used in contexts of anger, outrage, or a desire for justice, typically when people believe that the offender should face severe consequences for their actions.