bringing one's own lunch; self-catered
Refers to the act of preparing, bringing, or paying for one's own lunch, especially in contexts like company outings or meetings where meals might otherwise be provided.
Please participate in the company trip on a self-catered basis (bring your own lunch).
The meeting was held with everyone bringing their own lunch.
volunteer work; unpaid work
Describes working without compensation, often out of goodwill or for a cause. Frequently used in phrases like 手弁当で働く or 手弁当の活動.
They continue the local cleanup activities on a volunteer basis.
It is supported by unpaid volunteers.