Definition
"Bad blood" refers to a state of animosity or resentment between individuals or groups. It's a lasting feeling of ill will that often stems from past grievances or conflicts. Imagine two friends who had a major falling out and now can't stand to be in the same room. It involves a sense of hurt, anger, and distrust that lingers over time. This can manifest in avoidance, backstabbing, or open hostility. It is stronger than a simple disagreement, indicating a deeper, more personal level of conflict.