Unnoticed, not attracting attention.
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Staying out of sight so nobody notices.
When you stay under the radar, you avoid attention on purpose.
It also fits something that slipped past without anyone seeing it.
"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