* “A stitch in time saves nine.” This idiom means that it is better to take care of a problem early on before it becomes worse. In the novel, this idiom is used to describe the way that the Tucks try to protect themselves from the danger of being caught by humans.
* “Curiosity killed the cat.” This idiom means that being too curious can sometimes lead to problems. In the novel, this idiom is used to describe the way that Winnie gets involved in the Tucks' lives.