old sport
definitions
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A friendly, informal way of addressing a male friend, often used in a somewhat old-fashioned or upper-class manner.ja: 旧友
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A person who is a veteran or highly experienced athlete/sportsman.ja: ベテランスポーツマン
examples
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How are you doing, old sport?
調子はどうだい、旧友よ?
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He is an old sport who has played cricket for decades.
彼は数十年にわたりクリケットをプレーしてきたベテランスポーツマンです。