橋きょう台だいきょうだいMeanings1nounbridge abutmentCivil engineering term for the structure supporting the end of a bridge span and retaining the approach embankment.橋きょう台だいの設せっ計けいには、地じ盤ばんの安あん定てい性せいが重じゅう要ようです。Ground stability is important in the design of bridge abutments.