Kyūjitai form of 異体同心: harmony of mind between two persons; two persons acting in perfect accord

“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

an incisivus labii superioris muscle

it never rains but it pours

Kyūjitai form of 顔面騎乗 (“facesitting”)

Obsolete spelling of サクラメント平原 (“Sacramento Valley (a valley in California, United States)”)

an incisivus labii inferioris muscle

Kyūjitai form of 三位一体 (“Trinity”)

Kyūjitai form of 流体動力学 (“fluid dynamics”)

Kyūjitai form of 正八胞体: tesseract