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Definition of radar noun from the Oxford Advanced Learner's Dictionary

radar

noun
 
 
/ˈreɪdɑː(r)/
 
/ˈreɪdɑːr/
[uncountable]Idioms
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  1. a system that uses radio waves to find the position and movement of objects, for example planes and ships, when they cannot be seen
    • They located the ship by radar.
    • a radar screen
    compare sonar
    Extra Examples
    • The aircraft suddenly went off the radar.
    • The submarine is impossible to detect on radar.
    • navigation by radar
    Topics Transport by waterc1, Transport by airc1
    Oxford Collocations Dictionaryadjective
    • enemy
    • police
    • airborne
    • …
    verb + radar
    • be equipped with
    radar + noun
    • operator
    • station
    • system
    • …
    preposition
    • by radar
    • on radar
    phrases
    • off the radar
    • on the radar
    See full entry
    Word Origin1940s: from ra(dio) d(etection) a(nd) r(anging).
Idioms
below/under the radar
  1. used to say that people are not aware of something
    • Experts say a lot of corporate crime stays under the radar.
    • The conflict has slipped below the radar of the media.
on/off the radar (screen)
  1. used to say that people’s attention is on or not on something
    • The issue of terrorism is back on the radar screen.
    • Since the scandal broke, all other issues seem to have disappeared off the radar screen as far as the media is concerned.
See radar in the Oxford Advanced American DictionarySee radar in the Oxford Learner's Dictionary of Academic English
Check pronunciation: radar

Nearby words

dizzy
adjective
 
 
From the Topic
Health problems
C1
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