お大事に[odaijini] take care of yourself
暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
伊勢大神宮[isedaijinguu] the Grand Shrines of Ise
伊勢大廟[isetaibyou] the Grand Shrines of Ise
偉大[idai] greatness

医科大学[ikadaigaku] medical school
医大[idai] medical university
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一大[ichidai] one large ...
一大事[ichidaiji] serious affair

遺臣[ishin] surviving retainer
一夜大臣[ichiyadaijin] overnight millionaire
右大臣[udaijin] Minister of the Right (official in Nara and Heian periods)
運輸大臣[unyudaijin] Minister of Transport
下臣[kashin] low-rank retainer

家臣[kashin] vassal
外務大臣[gaimudaijin] Minister for Foreign Affairs
旧臣[kyuushin] old retainer
君臣[kunshin] ruler and ruled
建設大臣[kensetsudaijin] Minister of Construction