ichidan verb, intransitive verb
become empty; become hollow
Describes something becoming physically empty or hollow inside. Often used for containers, spaces, or objects losing their contents or substance.
箱の中身がなくなって、箱が空けた。
The contents of the box were gone, and the box became empty.
木の幹が虫に食われて空けて
The tree trunk was eaten by insects and became hollow.
ichidan verb, intransitive verb
become vacant; become absent-minded; zone out
Used for a person's mental state: relaxing from tension into a blank, vacant, or spaced-out condition. Often implies a temporary lack of focus or presence.
試験が終わって緊張が解け、頭が空けたような感じになった。
After the exam ended and the tension faded, I felt like my mind went blank.
彼は疲れていて、会議中に空けてしまった。
He was tired and zoned out during the meeting.