独りでに (Hitorideni) is a Japanese adverb meaning “by itself, automatically, naturally”.
Meanings
- adverbby itself; automatically; naturally
Examples
戸はひとりでに開いた。
The door opened by itself.
ドアがひとりでに開いた。
The door opened by itself.
明かりはひとりでに消えた。
The light went out by itself.
Sentences from Tatoeba (CC BY 2.0 FR).