The phrase “cute to boot” is an idiomatic expression that means something is not only cute but also has additional positive qualities or attributes. The word “boot” in this context is used as an intensifier, suggesting that the cuteness is an added bonus or enhancement.
For example, if someone describes a puppy as “cute to boot,” they might be emphasizing that the puppy is not only adorable in appearance but also friendly and playful, making it even more appealing. The phrase can be applied to a variety of subjects, including people, animals, and objects, to highlight their charm while also suggesting they possess other desirable traits.