A stock phrase in Japanese pop culture supposedly used by the wife in a newly-wed couple to invite her new husband to bed.

Kyūjitai form of 私生児 (“illegitimate child”)

(literally) know the other side and yourself, a hundred battles will not be perilous

(literary, attributive) a state of pure naturality, free from artifice

(idiomatic, proverb) be quick on the uptake, understand the whole situation from just a few clues

Rare form of テコンドー (tekondō, “taekwondo”).

arduous is the race against time as one grows old. (literally "as the sun goes down, the road remains a long one.")

Kyūjitai form of 道徳経 (“Tao Te Ching”)

Wide-Area Administration: a proposed plan to merge prefectures to create new local administrative divisions.

Kyūjitai form of 合気道 (“aikido”)