もらい笑わらい

noun

infectious laughter; laughing because others are laughing

Describes the phenomenon of starting to laugh when you see or hear others laughing, even without knowing the reason. Often used in the phrase もらい笑いをする.

• 彼かの女じょが笑わらい出だすと、周まわりももらい笑わらいをしてしまった。

  When she burst out laughing, everyone around caught the laughter too.

• 会かい議ぎ中ちゅうに