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English definition of “fall off/drop off the radar”

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fall off/drop off the radar

( also drop beneath the/sb's radar)
to be forgotten or ignored, often because someone's attention is on something more important: I was so busy at work, organizing a summer holiday just dropped off the radar.
(Definition of fall off/drop off the radar from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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