counterdemonstrate

verb

coun·​ter·​dem·​on·​strate ˌkau̇n-tər-ˈde-mən-ˌstrāt 

variants or counter-demonstrate

counterdemonstrated or counter-demonstrated; counterdemonstrating or counter-demonstrating

intransitive verb

: to make a demonstration (see demonstration sense 4) in opposition to another demonstration : to participate in a counterdemonstration

Thousands of activists in most major cities gathered to counter-demonstrate against official rallies.

—Gregory F. Domber

counterdemonstrator

ˌkau̇n-tər-ˈde-mən-ˌstrā-tər 

noun

or counter-demonstrator

plural counterdemonstrators or counter-demonstrators

Some counterdemonstrators gathered around a park bench and took turns addressing the crowd with a microphone, while others shouted from a distance at the people gathered for the rally.

—Evan Allen and Laura Crimaldi

Word History

First Known Use

1884, in the meaning defined above