御三時[osanji] three-o'clock snack
三鞭酒[shanpen] champagne
球面三角法[kyuumensankakuhou] spherical trigonometry
胸三寸[munesanzun] heart
元三[ganzan] New Year's period (January 1st to 3rd)

五十三次[gojuusantsugi] the 53 Toukaidou stages
向こう三軒[mukousangen] one's next three neighbors
降三世明王[gouzanzemyouou] Trailokyavijaya Vidya-raja
再三[saisan] again and again
再三再四[saisansaishi] repeatedly

丑年[ushidoshi] year of the ox
丑寅[ushitora] northeast
丑の刻[ushinokoku] two o'clock in the morning
丑の年[ushinotoshi] Year of the Ox
丑三つ時[ushimitsudoki] midnight

癸丑[mizunotoushi] 50th of the sexagenary cycle
草木も眠る丑三つ時[kusakimonemuruushimitsutoki] the dead of night
丑の日[ushinohi] day of the ox (esp. in midsummer or midwinter)
土用の丑の日[doyounoushinohi] day of the ox in midsummer (during the hottest season)