Definitions

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

  • adjective A separation from a groove, track, etc., that otherwise constrains motion.
  • adjective Australia, horse racing An unofficial trial race.
  • adjective US, slang A plainclothes narcotics officer.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From jump +‎ out.

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