plug up

plug up (third-person singular simple present plugs up, present participle plugging up, simple past and past participle plugged up)

1. (transitive) To put a plug or bung into something; to interrupt the flow of.
   • 2019 April 25, Samanth Subramanian, “Hand dryers v paper towels: the surprisingly dirty fight for the right to dry your hands”, in The Guardian‎:

     People often flush paper towels down toilets, plugging them up; […]

2. (transitive) To reinforce something weak.

• gulp up