noun
public security operation
Refers to a deployment or operation by authorities (e.g., police, Self-Defense Forces) to maintain public order and security.
大規模なデモに備えて、警察は治安出動の準備を整えた。
In preparation for the large-scale demonstration, the police readied a public security operation.
Compound of 治安 (public order) and 出動 (mobilization, deployment).