adverb, adverb taking the 'to' particle
in a whisper; in a low voice; in undertones
Describes speaking quietly so as not to be overheard; often used with 話す or 言う.
The two were whispering in the corner.
She whispered the secret in my ear.
The two of them were talking in whispers in the corner.
She conveyed something in a hushed voice.
The students were quietly discussing something behind the teacher's back.