running riot

Verb

run riot (third-person singular simple present runs riot, present participle running riot, simple past ran riot, past participle run riot)

1. (idiomatic) To act in an uncontrolled, unbridled manner.
   • In their idea, there is scarcely a finer tree than the Kavika; and when in their fairy tales the imagination runs riot, and describes all that is lovely and beautiful, the Kavika is rarely omitted.1862, Berthold Seemann, Viti: an account of a government mission to the Vitian or Fijian Islands, in the years 1860-61, Cambridge: Macmillan & Co., →OCLC, page 318
2. (idiomatic) To be uncontrollable.
   • And it was only the defiance of Cech that kept a rampant Spurs at bay in the second half, producing a collection of outstanding saves to somehow keep Arsenal in contention as Pochettino's side threatened to run riot.2018 February 10, Phil McNulty, “Tottenham Hotspur 1 - 0 Arsenal”, in BBC