an elasticized belt, a men's undergarment, with a pouch for supporting and protecting the genitals, worn especially while participating in athletics.
Also called athletic supporter.

1895–1900; jock male organ (variant of jack1 male; see Jock) + strap Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jockstrap (ˈdʒɒkˌstræp)
Also called: athletic support an elasticated belt with a pouch worn by men, esp athletes, to support the genitals
[C20: from slang jock penis + strap]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Until then, for example, anyone competing in a powerlifting event was required to wear a jockstrap.
Oh yeah, don't forget to wear your jockstrap on the outside of your pants and steal your grandfathers cane.
The word literally means waist purse but seems to have rude connotations along the lines of jockstrap carrier.
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