Definition of “mushroom” - English Dictionary

“mushroom” in British English

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mushroomnoun [ C ]

uk /ˈmʌʃ.ruːm/ /ˈmʌʃ.rʊm/ us /ˈmʌʃ.ruːm/ /ˈmʌʃ.rʊm/

A2 a fungus with a round top and short stem. Some types of mushroom can be eaten:

wild/cultivated mushrooms
button (= very small) mushrooms
cream of mushroom soup
For this recipe choose mushrooms with large caps (= top parts).
Unfortunately some poisonous mushrooms look like edible mushrooms.
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mushroomverb [ I ]

uk /ˈmʌʃ.ruːm/ /ˈmʌʃ.rʊm/ us /ˈmʌʃ.ruːm/ /ˈmʌʃ.rʊm/

(Definition of “mushroom” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“mushroom” in American English

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mushroomnoun [ C ]

us /ˈmʌʃ·rum, -rʊm/

mushroom noun [ C ] (PLANT)

any one of many types of fast-growing fungus (= plants without leaves or flowers) with a round top and short stem, many of which are used as food:

wild mushrooms
mushroom soup
a pizza with mushrooms

mushroomverb [ I ]

us /ˈmʌʃ·rum, -rʊm/

mushroom verb [ I ] (GROW)

to grow quickly:

If your business were to mushroom, would you be happy?

(Definition of “mushroom” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“mushroom” in Business English

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mushroomverb [ I ]

uk /ˈmʌʃruːm/ us informal

to increase in number or develop very quickly:

Low-cost airlines have mushroomed in recent years.
mushroom into sth The walkout mushroomed into a large-scale battle.
mushroom from sth to sth Area budgets mushroomed from $3.7 billion in 2005 to more than $6.3 billion this fiscal year.

(Definition of “mushroom” from the Cambridge Business English Dictionary © Cambridge University Press)