Comprehensive resource for understanding and mastering English idioms
"Bad blood" is an idiom that refers to a hostile or unpleasant relationship between two individuals or groups. It can also indicate a feeling of ill will, animosity, or malice towards someone or something. The figurative or metaphorical meaning of "bad blood" is often used in contemporary language to describe a situation where there is tension, conflict, or animosity between people or organizations. It suggests that the relationship between the individuals involved is characterized by negative emotions and behaviors that make it difficult for them to work together or cooperate.
The origin of "bad blood" is uncertain, but it has been used in English since at least the 17th century. One theory suggests that the phrase comes from the idea of bad blood being a liquid or substance that can be passed between individuals, such as through rivalries or feuds. Another theory suggests that it may have originated from the idea of bad blood being a trait or characteristic that is inherited or passed down from one generation to the next. Over time, the meaning and usage of "bad blood" has evolved to reflect changing attitudes and cultural norms. For example, in some cultures, there may be a greater emphasis on resolving conflicts and maintaining harmonious relationships, which could lead to a less negative connotation associated with bad blood. However, in other contexts, such as in competitive sports or business environments, the desire for victory or success may lead to more intense feelings of animosity and ill will.