kettling
noun /ˈketlɪŋ/
/ˈketlɪŋ/
[uncountable] (especially British English)- the action by police of keeping a group of people who are taking part in a demonstration or protest held in an area with no easy way out, in order to make them behave in a peaceful way again
- Police used tactics such as kettling in an attempt to bring an end to the protest.