admission to an institution or facility (e.g., research institute, nursery, care home); entering and starting to stay/ work there
祖母は体調を考えて老人ホームに入所した。
Considering her health, my grandmother was admitted to a nursing home.
彼は有名な研究所に入所して研究を続けることになった。
He entered a well-known institute to continue his research.
児童養護施設に入所する子どもたちを支援する。
We support children who enter childcare institutions.
imprisonment; incarceration; confinement (e.g., being placed in a prison or detention facility)
容疑者は留置場に入所された。
The suspect was placed in a detention facility.
事件の関係者が一時的に施設に入所した。
Those involved in the case were temporarily confined to a facility.