had been mushrooming

• past perfect progressive

  past perfect progressive

  Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.

  of mushroom.
  mushroom

  noun

  any of various fleshy fungi including the toadstools, puffballs, coral fungi, morels, etc.

Related Words

• boom
• burgeon
• expand
• explode
• flourish
• proliferate
• shoot up