Here's how:
* Imagery: The phrase paints a vivid picture in the reader's mind, evoking a sense of intensity, passion, or even danger.
* Symbolism: Red lips can symbolize passion, seduction, danger, or even violence.
* Metaphor: The "blood" part of the phrase could be a metaphor for something else. For example, "her lips were blood red with the pain of her betrayal."
* Personification: Describing lips as "blood red" can personify them, giving them a sense of agency or power.
It's important to consider the context in which the phrase is used to determine its specific literary effect.
For example, in a romantic poem, "blood red lips" might symbolize passion and desire. In a horror story, it might symbolize danger or violence.
Do you have a specific instance of "blood red lips" in mind? I might be able to tell you more about its literary effect in that context.