Final answer:
The phrase 'a sea of dead bodies' is a metaphor that compares the vast number of bodies to a sea, emphasizing their multitude.
Step-by-step explanation:
The expression 'a sea of dead bodies' is an example of a figure of speech known as a metaphor. A metaphor draws a comparison between two unrelated things by stating that one thing is another, providing a powerful mental image and emphasizing the extent or magnitude of a situation. In this case, 'a sea' suggests vastness and multitude, as if the dead bodies were as plentiful as water in the sea, conveying a sense of overwhelming numbers without literally having a sea made of bodies. It's used to evoke the grim reality of a battlefield or a disaster scene in a vivid and impactful way.