adverb, adverb taking the 'to' particle
stealthily; secretly; on the sly
Describes doing something quietly and secretly so as not to be noticed by others. Often used with verbs of movement, communication, or action.
彼はこっそり部屋を抜け出した。
He slipped out of the room stealthily.
こっそり教えてあげるね。
I'll tell you secretly.
He sneaked into the room in the middle of the night.
My little sister secretly took out some snacks.
The students slipped out of the classroom unnoticed during class.