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出典:Wiktionary
A compound of horse + play, possibly from observation of boisterous horses playing, or from its attributive sense "strong, big or coarse".
horseplay (uncountable)
horseplay (三人称単数 現在形 horseplays, 現在分詞 horseplaying, 過去形および過去分詞形 horseplayed)
horse-play (uncountable)
horseplay