mushroom
noun
any of various fleshy fungi including the toadstools, puffballs, coral fungi, morels, etc.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
But with little publicity, the number of young children who routinely spend part of the day unsupervised has been mushrooming.
From Time Magazine Archive
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