sweet science

　UG先生ご指名ありがとうございます。メイウェザーとバッキャオの歴史的な試合が5月2日に行われますね。文脈を見ると"sweet science"が「ボクシング」を指していることが分かります。語源を調べてみると，Why Boxing is Called the Sweet Science | iSport.comというサイトに書いてありました。この言葉は，Pierce Egan氏というジャーナリスト兼スポーツライターが生み出したようです。彼はスポーツのなかでもボクシングに関心を持っており，"Boxiana"という雑誌に記事を載せております。その中で，しばしば「ボクシング」を"sweet science"と呼んでおります。ボクシングは，屈強であるだけでなく，科学のように秩序だった思考が要求されることからこのような表現になったのだと思います。（Ume）

Pierce Egan was a British journalist and sportswriter in the early 1800s. He wrote about a variety of sports, but most of his articles concern bare-knuckle boxing and horse racing.
Egan is best known for his five volumes of boxing articles titled Boxiana. The first volume was published in 1813 and the series was completed in 1828. Within his articles, he often refers to boxing as the “Sweet Science of Bruising,” a phrase that acknowledges boxers as both methodical and tough. Boxiana experienced tremendous success in the early 19th century, for it combined luminous illustrations with knowledgeable writing concerning the most popular illegal sport of the time. Learn more about boxing's ancient history with iSport's History of Boxing.

Read more at: http://boxing.isport.com/boxing-guides/why-boxing-is-called-the-sweet-science