run rampant

idiom

Definition of run rampant

: to be very common or to spread very quickly and in a way that is difficult to control Rumors of her engagement ran rampant.

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“Run rampant.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/run%20rampant. Accessed 6 December 2019.

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