Jisho

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Noun
1. trunks (swimming, boxing, etc.)
Noun
2. trunks (underwear); boxers; boxer shorts
Wikipedia definition
3. Boxer shortsBoxer shorts (also known as loose boxers or as simply boxers) are a type of undergarment typically worn by men. The term has been used in English since 1944 for all-around-elastic shorts, so named after the shorts worn by boxers, for whom unhindered leg movement ("footwork") is very important. Reasons for a preference for boxers can be attributed to their variety of styles and design as well as the way boxers look on the wearer.
Read “Boxer shorts” on English Wikipedia
Read “トランクス” on Japanese Wikipedia
Read “Boxer shorts” on DBpedia

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