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Definition defeat device in British English

defeat device noun

noun
1

a piece of equipment which senses when a machine is being tested to make sure it meets emissions standards. The device switches on when the machine is being tested and off when it is operating normally, leading to higher levels of harmful emissions being produced than when the machine is being tested.

Example

This is the first time that VW has revealed how many of the 11m cars that were fitted with a defeat device to cheat emissions tests were in the UK.

Definition defeat device in British English