Denshi Jisho — Online Japanese dictionary

Found 3 sentences.

ひそひそ話した He spoke under his breath.
両親昨晩ひそひそしている聞いた I heard my parents whispering last night.
少年たちひそひそしていた何かたくらんでいるわかった The boys were whispering; I knew they were up to something.