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have been mushrooming
  • present perfect progressive of mushroom.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Online subscriptions of all kinds have been mushrooming in recent years.

From New York Times • Jul. 7, 2023

Flames have been mushrooming rapidly in eastern Canada and have forced evacuations in the Atlantic province of Nova Scotia as well as coastal Quebec.

From Reuters • Jun. 5, 2023

But cries for federal authorities to take a closer look at the potential hazards have been mushrooming after many athletes who played extensively on synthetic fields were diagnosed with cancer.

From Washington Times • Jan. 30, 2016

Small publishing houses devoted to science fiction such as Weinbaum turned out have been mushrooming during the last few years, and the business as a whole appears to be on the upgrade.

From Time Magazine Archive