Final answer:
Foreshadowing is the literary device where an author gives hints about future events in a story's plot, such as the warning Tiriesias gives Creon in Antigone.
Step-by-step explanation:
When an author leaves clues about what will happen later in the story, this technique is called foreshadowing. Foreshadowing is an essential literary device that authors use to give hints about the plot developments to come before they actually happen. An example of foreshadowing can be found in the play Antigone, where Tiriesias warns Creon that something terrible will happen to his family unless he apologizes to the gods and frees Antigone.