Definition of "mushrooming"

mushrooming

verb
1. present participle and gerund of mushroom
noun
countable and uncountable, plural mushroomings
1. The act of gathering mushrooms.
  Quotations
  I'll lock up and go watercressing. Or mushrooming. Or some damn thing.
  1972, H. E. Bates, The Song of the Wren
2. Rapid or explosive growth.
3. The formation of a mushroom-like shape.