交头接耳 (jiāo tóu jiē ěr): Whisper together / exchange whispers — Meaning & Stroke Order

At a serious academic conference, the audience should not whisper together.

Why are you whispering together in the corner? Do you have a secret?

Although the atmosphere on site was tense, no one dared to exchange whispers.

When they saw the teacher come in, the students immediately stopped whispering to each other.