平ひら坪つぼMeanings1nountsubo; traditional unit of land areaA traditional Japanese unit of area equal to one square ken (about 3.31 m²). Used in real estate and land measurement contexts.See also: 坪 · 立て坪この土と地ちは約やく五ご十じゅう平ひら坪つぼあります。This plot of land is about fifty tsubo.