くすくす

adverb, adverb taking the 'to' particle

chuckle; giggle

Describes a quiet, suppressed laugh, often shared among a small group or when trying not to be heard. Frequently used with 笑う.

See also: くすくす笑う (くすくすわらう)

• 友とも達だちとくすくす笑わらいながら話はなした。

  I chatted with my friend while giggling quietly.

• 教きょう室しつの後うしろで誰だれかがくすくす笑わらっている。

  Someone is chuckling in the back of the classroom.