What is the verb for broad?

There isn't a single verb that directly means "to be broad" in the same way that "to be wide" or "to be tall" do. However, depending on the context, you could use various verbs to convey the idea of being broad, such as:

* Expand: This suggests making something wider or larger. Example: "The company expanded its product line."

* Widen: This specifically means to make something wider. Example: "The road widened as we approached the city."

* Spread: This suggests covering a large area. Example: "The news spread quickly."

* Enlarge: This means to make something bigger in size. Example: "They enlarged the picture for better visibility."

* Extend: This suggests making something longer or wider. Example: "The garden extends behind the house."

* Embrace: This can be used figuratively to suggest being open to a wide range of ideas or perspectives. Example: "She embraced new technologies."

The most appropriate verb would depend on the specific context and what you're trying to convey.