伝家の宝刀

でんかのほうとう

expression, noun

one's last resort, trump card(idiom )

treasured family sword(orig. meaning)

伝	transmit, go along, walk along, follow, report, communicate, legend, tradition
家	house, home, family, professional, expert, performer
宝	treasure, wealth, valuables
刀	sword, saber, knife
殿	Mr., hall, mansion, palace, temple, lord
下	below, down, descend, give, low, inferior