Answer: mushroomed

AnswerCrossword Clue
MUSHROOMEDGot out of hand.
mushroomedIncrease, spread, or develop rapidly
mushroomed(of a person) Gather mushrooms
mushroomed(of a bullet) Expand and flatten on reaching its target
mushroomed(of the smoke, fire, or flames produced by an explosion) Spread into the air in a shape resembling that of a mushroom
mushroomedMUSHROOM, to grow or spread rapidly