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

簇がる[muragaru] to swarm
上簇[jouzoku] spinning of cocoons
簇生[zokusei] (of plants) growing in clusters
簇出[zokushutsu] springing up in clusters

太簇[taizoku] (in China) 3rd note of the ancient chromatic scale (approx. E)
簇出[soushutsu] springing up (in clusters)
簇々[zokuzoku] gathering