Basic Definition: The word "butternut" refers to a type of nut that comes from a tree known as the butternut tree. This tree is part of the walnut family, and it produces a soft, oily, egg-shaped nut that people can eat. The wood from the butternut tree is light brown and is often used for making furniture. Additionally, the tree can be used to make a light-brown dye.
In more advanced contexts, "butternut" can also refer to the butternut squash, which is a type of vegetable that has a sweet, nutty flavor.
There aren't specific idioms or phrasal verbs that commonly use "butternut." However, you might hear phrases like "to squash something" as a metaphor for suppressing an idea, but this does not relate directly to butternut.
"Butternut" is a versatile word that can refer to a nut, a tree, or a type of squash. It is primarily used in discussions about food, nature, or woodworking.