radar

Etymology

Originally spelled RADAR; an acronym of radio detection and ranging. Coined by the United States Navy in 1940.

noun

1. (uncountable) A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
   The enemy fleet was able to be found using radar.
2. (countable) A type of system using such a method, differentiated by platform, configuration, frequency, power, and other technical attributes.
3. (countable) An installation of such a system or of the transmitting and receiving apparatus.
4. (countable, figurative) A superior ability to detect something.
   His sensitive radar for hidden alliances keeps him out of trouble.
   It came inside 50 minutes and moments later Cavani should have had a 12th. Pogba and Shaw combined before the left-back's cross teed up the striker but his radar was awry. 29 April 2021, Jamie Jackson, “Edinson Cavani and Bruno Fernandes help Manchester United hit Roma for six”, in The Guardian

verb

1. To scan with radar, or as if with radar.
   He radars you while he's sitting in his patrol vehicle under a bridge. 2002, Brian Jonathan Wolk, Ohio Traffic Tickets are for the Birds, page 156