pile-on

Noun

pile-on (plural pile-ons)

1. An argument or fight in which one side is greatly advantaged by being more numerous or more closely allied than the other side.
   • We are in a time of never-ending Twitter pile-ons. Sometimes the criticism is warranted: Twitter can be a place for marginalised voices to amplify or bring attention to an injustice they have suffered.2019 November 19, Brigid Delaney, “It's the era of the Twitter pile-on. Isn't there something healthier we can do with our rage?”, in The Guardian
   • A social media “pile-on” against anyone who criticises Sinn Féin does not aid or assist the party, its housing spokesman has said.2020 December 6, Marie O'Halloran, “Social media ‘pile on’ against Sinn Féin critics does not aid party, Ó Broin says”, in The Irish Times