Definition of “radar” - English Dictionary

“radar” in American English

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radarnoun [ C/U ]

us /ˈreɪ·dɑr/

a device or system for finding the position or speed of objects, such as aircraft, that cannot be seen, by measuring the direction and timing of short radio waves that are sent out and reflect back from the objects

(Definition of “radar” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“radar” in Business English

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radarnoun [ C ]

uk /ˈreɪdɑːr/ us
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” from the Cambridge Business English Dictionary © Cambridge University Press)