蔓延(はびこ)るto become overgrown, to grow thick, to spread, to run rampant, to thrive, to prevail, to become powerful

Common

1. う-verb (る), Intransitive verb

   1. 1.

      to become overgrown, to grow thick

      Usually written using kana alone

   2. 2.

      to spread, to run rampant, to thrive, to prevail, to become powerful

      Usually written using kana alone