腹はらの中なかで笑わらう

expression, godan verb (-u)

laugh to oneself; smile to oneself

Describes inwardly laughing or smiling without showing it outwardly; often used when one finds something secretly amusing or ironic.

• 彼かれの言いい訳わけがおかしくて、腹はらの中なかで笑わらった。

  His excuse was so ridiculous that I laughed to myself.

• 上じょう司しの前まえでは真面目まじめな顔かおをしていたが、腹はらの中なかで笑わらっていた。

  I kept a straight face in front of my boss, but I was laughing inside.