keep under surveillance
idiom
: to watch (someone or something) closely especially in order to prevent or detect a crime
The police kept her/the building under surveillance.
Cite this Entry
“Keep under surveillance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keep%20under%20surveillance. Accessed 25 Jul. 2025.
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