Metonymy
Definition: When a phrase is replaced with something closely related to it.
Example: “That shadow of death hunted in the darkness,” ( Grendel 74). The “shadow of death” is Grendel and the “darkness” is night time.
Example: “That shadow of death hunted in the darkness,” ( Grendel 74). The “shadow of death” is Grendel and the “darkness” is night time.