How do you use mushroom as a verb?

"Mushroom" isn't typically used as a verb in standard English. It's primarily a noun, referring to the fungus.

However, there are a few instances where "mushroom" might be used in a metaphorical way, implying a rapid growth or increase:

* "The company mushroomed after the successful launch of their new product." This implies that the company grew rapidly in size and importance.

* "The city's population mushroomed in the early 20th century." This suggests a rapid increase in population.

These uses are less common than the noun form, and might be considered informal.

If you're looking for a more formal verb to express rapid growth, consider alternatives like:

* "Expand"

* "Flourish"

* "Proliferate"

* "Increase exponentially"