Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun slang Especially on trucks, an engine compression brake that closes the valves in an engine in order to slow the vehicle; an engine retarder.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From JakeBrakeTM brand compression brakes. Though a brand name, this term is often used to refer to the device in general.

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