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- 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.
- 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.
- Amy Goodman; Marisa Holmes, Marina Sitrin, and Laurie Penny (October 3, 2011), “700 Arrested on Brooklyn Bridge as Occupy Wall Street Enters Third Week, Protests Grows Nationwide”, in (Please provide the title of the work), Democracy Now!, retrieved October 3, 2011