Final answer:
In this literary passage, the phrase 'dead white' is used metaphorically to describe the headmaster's face. It suggests shock or fear, intensifying the impact of his reaction.
Step-by-step explanation:
In the context of the sentence you provided, the phrase 'dead white' is used metaphorically to describe the headmaster's face.
It suggests that the headmaster's face turned pale, indicating shock or fear. The use of the term 'dead' implies lifelessness, which intensifies the impact of the described reaction.
This figurative language emphasizes the headmaster's extreme emotional state and helps to create a vivid image of his reaction. By comparing his face to something lifeless, the author conveys the intensity of the headmaster's emotional response.
Overall, the phrase 'dead white' in this context enhances the description of the headmaster's reaction and contributes to the characterization and atmosphere of the scene.