Unnoticed, not attracting attention.
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Avoiding attention or going unnoticed by others.
When something or someone is under the radar, they are operating without being observed, monitored, or detected by those who might otherwise take notice.
It is used when someone deliberately keeps a low profile or when something has gone unnoticed.
"Keep a Low Profile"
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To deliberately avoid attention or public exposure
"Fly Under the Flag"
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To operate under a different identity or affiliation
"Under the Radar"
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To go undetected or avoid notice from others