for one's mind to go blank, to freeze

cephalopod

(anatomy) glans penis

Kyūjitai form of 断頭台 (“guillotine”)

polyarchy

“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

a Steller's eider

"natural hair certificate": a certificate requested by some Japanese schools that affirm that a student's hair color is naturally not black, not straight, etc.

Simplified Chinese (Chinese written using simplified characters)

Traditional Chinese (Chinese written using traditional characters)