kettlings

Noun

kettling (usually uncountable, plural kettlings)

1. (usually) A crowd control technique, used by police, where a hostile group of protesters or rioters are surrounded and not allowed to disperse, sometimes with the use of temporary fencing to corral and isolate portions of the group.
   • These are our young, screaming out in need, meriting not kettling and reprimands, but job prospects and dignity.2011 October 12, Gregory Djerejian, “This Ain't No Tea Party: A Conservative Defense of Occupy Wall Street”, in The Atlantic
2. (usually) The situation where water gets trapped in the heat exchanger of a boiler (e.g. due to limescale build-up), resulting in knocking sounds as it turns into expanding steam.