To breach, To break through or violate a barrier, rule, or security system., To eavesdrop (on), To secretly listen to someone else's private conversation., Surveillance, The act of closely watching a person, place, or activity, often for security reasons., CCTV, Cameras placed in public or private areas to monitor and record activity for security., Raise the alarm, To warn others about danger or an emergency., Verify identity, To check and confirm that someone is who they claim to be., Be on high alert, To be ready and prepared for possible danger or trouble., Fly under the radar, To go unnoticed or avoid detection., Phone tap, Secretly listening to or recording someone's phone conversations., Biometrics, Using unique physical characteristics, like fingerprints or eye scans, to identify a person..

Security: definitions

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