Many of us use multiple common expressions without ever stopping to consider their etymologies.
Some of them make reasonable, and we comprehend the essence of them.
But many of us don't realize that their roots are really pretty sinister.
Some of the expressions we use today have gone a long way, and from very dark places.
Such as the medieval battlefield and the era of slavery from whence they evolved.
One of the most ubiquitous expressions you'll hear throughout your lifetime.