ra‧dar /ˈreɪdɑː $ -ɑːr/ noun
[Date: 1900-2000; Origin: radio detection and ranging]

1. [uncountable and countable] a piece of equipment that uses radio waves to find the position of things and watch their movement ⇒ sonar:
The coastline can now be monitored by radar.
We could see the plane quite clearly on the radar screen.

2. on somebody's/the radar (screen) if something is on your radar, you have noticed it and are giving it some attention:
This is one of the issues on our radar.

3. fly/slip under somebody's/the radar to not be noticed by someone:
How did this band slip under the radar?

[TahlilGaran] Dictionary of Contemporary English ▲

radar
noun
ADJ. enemy, police
VERB + RADAR be equipped with
RADAR + NOUN operator | screen | beam, signal | equipment, scanner, station, system, transmitter
PREP. by ~ navigating by radar
on ~ The submarine is impossible to detect on radar.

[TahlilGaran] Collocations Dictionary ▲

RADAR
Radio Detection And Ranging 
Retrieve Assess Decide Action Review (decision making process)

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲