jock off

English

Verb

jock off (third-person singular simple present jocks off, present participle jocking off, simple past and past participle jocked off)

1. (transitive, informal, horse racing) To replace (a jockey) with another.
   • 2012, Robin Oakley, Britain and Ireland's Top 100 Racehorses of All Time:

     Dawn Run's owner, Charmian Hill, who had insisted on trainer Paddy Mullins 'jocking off' his son Tony and putting up Jonjo O'Neill to ride her in the Gold Cup, was an awkward cuss too.