Etymology
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The phrase most likely originated during NASCAR broadcasts in the 1970s, when stock cars still had chrome bumpers.
Pronunciation
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chrome horn (plural chrome horns)
- (idiomatic) The front bumper of a car when used to bump another vehicle, usually to inform the driver of the other vehicle that the first car would like to pass.
- Dale Earnhardt just put the chrome horn to that lapped car in front of him.