No. 10,467 in German
radar
Radar: A system for detecting objects and determining their distance, speed, and position using radio waves.
In a sentence
Das Flugzeug wurde auf dem Radar entdeckt.
The airplane was detected on the radar.
Here, 'Radar' refers to the physical device used for detecting objects in the airspace.
Seine Pläne bleiben unter dem Radar.
His plans remain under the radar.
In this idiomatic usage, 'Radar' represents general notice or awareness, implying not being noticed.
Hast du gehört, dass sie einen neuen Radar entwickelt haben?
Did you hear that they developed a new radar?
In this case, 'Radar' refers to a new technology or equipment for detection purposes.
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