say it: jahk
jock is a noun meaning "a person trained to compete in sports". It carries 2 recorded senses.
a person trained to compete in sports
a support for the genitals worn by men engaging in strenuous exercise
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for jock come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.