ˈjäkˌstrap noun
also jock or jockey strap
( -s )
Etymology: jockstrap from English slang jock penis (short for earlier jockam, jockum, of unknown origin) + strap; jock short for jockstrap; jockey strap alteration of jockstrap
: a supporter for the genitals worn by men participating in sports or strenuous activities : an athletic supporter