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English definition of “radar”

radar

noun [C]     /ˈreɪdɑːr/
below/under the radar (also below/under the radar screen) if something is below or under the radar, people are not aware of it: They were operating under the radar, selling their Web wares from some garage in Bakersfield. Many private treatment centres are slipping under the radar screen of the medical authorities.
on/off the radar (also on/off the radar screen) used to say that people do or do not know about something or that something is or is not important to someone: He dropped off the political radar for nearly two decades. Toy safety is definitely on consumers' radar.
(Definition of radar noun from the Cambridge Business English Dictionary © Cambridge University Press)
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