roar back

roar back (third-person singular simple present roars back, present participle roaring back, simple past and past participle roared back)

1. (intransitive, idiomatic) To suddenly become active, powerful or functional after a period of decline.

   Synonyms: come roaring back, roar to life

   • 2023 May 10, Benjamin Mueller, “Pancreatic Cancer Vaccine Shows Promise in Small Trial”, in The New York Times‎:

     They would test their novel cancer vaccine against one of the most virulent forms of the disease, a cancer notorious for roaring back even in patients whose tumors had been removed.

• “roar back” in Longman Dictionary of Contemporary English, Longman.