a support for the genitals worn by men engaging in strenuous exercise
"After tying his shoelaces, he adjusted his jock to make sure it was secure before heading out for soccer practice."
A common man.
"The jock brought his bagpipes to the festival, delighting everyone with traditional Scottish tunes."
A jockey.
A Scot.
to masturbate
"The coach was furious when he caught his player jocking off in the locker room."
A nickname.
"The coach slapped his teammate on the back and called him Jock before they ran onto the field."