godan verb (-ru), transitive verb
to fit (inside something); to be fully contained
Used when something can be completely placed or accommodated inside a container, space, or capacity. Often used in the potential form 入りきれる or negative 入りきらない.
この箱に本が全部入りきるかな。
I wonder if all the books will fit in this box.
スーツケースに服が入りきらなかった。
The clothes didn't fit in the suitcase.