From Longman Dictionary of Contemporary Englishjockstrapjock‧strap /ˈdʒɒkstræp $ ˈdʒɑːk-/ noun [countable] DCCDSa piece of men’s underwear that supports their sex organs during sport
Examples from the Corpus
jockstrap• Simply walk through a town centre of your choosing wearing nothing but army boots and a jockstrap.• In mud wrestling both fighters wear only a jockstrap.• Claire has never seen a man in a leopardskin jockstrap before.• Looks like he's padded his leopardskin jockstrap too.• He is wearing only the pads and a pink jockstrap.• The winner is the man who pulls the other guy's jockstrap off.• He spent two hours dying the jockstrap.• The padded shoulders, the hip pads, the jockstrap.Origin jockstrap (1800-1900) jock “male sex organ” (JOCK ITCH) + strap 