expression, godan verb (-u)
giggle; chuckle quietly
Describes a suppressed, soft laugh, often with a repeated 'kusu-kusu' sound. Used for quiet, restrained giggling, not loud laughter.
彼女は後ろの席でくすくす笑っていた。
She was giggling quietly in the back seat.
友達と内緒話をし
I giggled with my friend while whispering secrets.