under the radar

Etymology
An allusion to flying an airplane at an altitude too low for radar detection.

Prepositional phrase

 * 1)  Without attracting notice; in an undetected or secretive manner.

Synonyms

 * See also Thesaurus:covert

Translations

 * Finnish:, ,
 * French:
 * Hungarian:
 * Indonesian:
 * Russian: под радаром
 * Swedish: under radarn


 * Icelandic: