(chiefly meteorology) A radar system using the Doppler effect to measure the radial velocity of detected objects, allowing moving objects (such as airplanes, precipitation, missiles, etc.) to be distinguished from stationary ones and classified by magnitude and direction of their velocity towards or away from the radar site.

Being under consideration by someone.

A radar system capable of detecting, tracking and discriminating a large number of targets simultaneously

(idiomatic) To vanish or fall into obscurity.

(idiomatic) To go unnoticed, especially for a long period of time.

present participle of slip under the radar

(idiomatic) To go unnoticed, especially for a long period of time.

present participle of fly under the radar

simple past tense and past participle of slip under the radar

Third-person singular simple present indicative form of fly under the radar