mushroom
The word carries a strong sense of sudden, explosive growth. Because fungi can appear overnight after rain, the term evokes a feeling of surprise and rapid proliferation. It is often used to describe urban sprawl or the sudden popularity of a trend.
In a culinary or biological sense, the word is neutral, but when used as a verb, it often implies a lack of control or an overwhelming pace of expansion. It differs from growth or expansion by emphasizing the speed and the "popping up" nature of the increase.
Countable when referring to the individual fungi you can count in a basket. Uncountable when referring to the food ingredient used in a recipe.
Meanings
Examples
That is a mushroom.
Coffee shops are mushrooming in this neighborhood.
Phrasal Verbs
mushroom up
to appear or grow rapidly in a short period of time
Small villages quickly mushroomed up into bustling towns during the gold rush.