For example, a news report about a war might use the phrase "those ravening foes" to describe the opposing army, emphasizing the ferocity with which they are fighting and the sense of urgency they feel in achieving their goals. Similarly, a political speech might use the term to refer to opponents within the government who are seen as being determined to block certain reforms.
The phrase can also be used in a more general sense to refer to any kind of obstacle that someone is trying to overcome. For example, a person might talk about "those ravening foes" that are standing in the way of their professional success or personal happiness. In these cases, the term is used to highlight the challenges and obstacles that must be faced in order to achieve a goal.