mushrooming

noun

1. (countable, uncountable)The act of gathering mushrooms.

   “I'll lock up and go watercressing. Or mushrooming. Or some damn thing.”

2. (countable, uncountable)Rapid or explosive growth.
3. (countable, uncountable)The formation of a mushroom-like shape.

verb

1. (form-of, gerund, participle, present)present participle and gerund of mushroom

   “The enormous growth of the railway during that period ran in parallel with mushrooming housing developments along the lines.”