Final answer:
The sentence foreshadows that some kind of evil will visit the White family.
Step-by-step explanation:
The sentence from paragraph 64 of the story foreshadows the events to come by suggesting that some kind of evil will visit the White family. The use of the word 'horrible' and the idea of something squatting on top of the wardrobe watching suggests a menacing presence. This foreshadows that the White family will experience something negative or dangerous in the future.
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