What is the origin of the idiom "cross swords" and when to use it?

The idiom "cross swords" has its origin in the literal act of engaging in a sword fight or combat with crossed blades. Over time, the phrase evolved into a metaphorical expression, indicating a conflict, dispute, or disagreement between individuals or groups. The imagery of crossed swords emphasizes the confrontational nature of the interaction, often implying a clash of opposing views or interests.