独ひとり笑わらい

noun, noun or participle which takes 'suru'

laughing to oneself; solitary laughter

Refers to the act of laughing alone, often involuntarily or when recalling something amusing. Can be used as a noun or with する.

• 彼かれは思おもい出だし笑わらいで、ひとり笑わらいをしていた。

  He was laughing to himself, remembering something funny.

• 電でん車しゃの中なかで突とつ然ぜんひとり笑わらいをしてしまい、恥はずかしかった。

  I suddenly laughed to myself on the train and felt embarrassed.

noun

shunga; erotic pictures

Obsolete term for erotic art, especially shunga. The cross-reference to 春画 indicates this is a historical usage.

See also: 春画

• 江え戸ど時じ代だいには「ひとり笑わらい」が春しゅん画がを指さす隠いん語ごとして使つかわれた。

  In the Edo period, 'hitoriwarai' was used as a slang term for shunga.