mushroom
US /ˈmʌʃ.ruːm/
UK /ˈmʌʃ.ruːm/
1.
a fungal growth that typically takes the form of a domed cap on a stalk, often with gills on the underside of the cap. Many are edible, but some are poisonous.
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She picked wild mushrooms in the forest.
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Add sliced mushrooms to the stir-fry.
1.
to increase, spread, or develop rapidly
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The small business quickly mushroomed into a large corporation.
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Problems began to mushroom after the new policy was implemented.