under the radar idiom 1. Going unnoticed. 2. Doing something without anyone noticing.
BS Definition: Slipping that calculator from work into your computer bag because your child needs it for homework.
Origin: Radar itself—which stands for “radio detection and ranging”—started with experiments by German scientist Heinrich Hertz in the late 19th century. Hertz showed that radio waves could be reflected by metallic objects, but it wasn’t until June 17, 1935, that the first radio-based detection and ranging system was first demonstrated in Britain, thanks to the work of Robert Watson-Watt, a physicist specializing in radio waves.1
The individual ...
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