jock·strap
noun/ˈdʒɒkstræp/
/ˈdʒɑːkstræp/
(also athletic supporter especially in North American English)
- a piece of men’s underwear worn to support or protect the sexual organs while playing sports
（男子运动时穿的）下体护身 Word Originlate 19th cent.: from slang jock ‘genitals’ (of unknown origin) + strap.