keep under surveillance

idiom

Definition of keep under surveillance

: to watch (someone or something) closely especially in order to prevent or detect a crime The police kept her/the building under surveillance.

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“Keep under surveillance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keep%20under%20surveillance. Accessed 5 Mar. 2021.

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