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From The Collaborative International Dictionary of English v.0.48:
jock \jock\ n. 1. a person trained to compete in sports; an athlete. [WordNet sense 1] Syn: athlete. [WordNet 1.5] 2. A jockstrap. [PJC] 3. A disk jockey. [PJC] shock jock a radio talk-show host who is notorious for voicing unpopular, controversial, or shocking opinions guaranteed to offend many people. [PJC]