mutual aid; mutual help; cooperation
共助で地域が支え合う。
The community supports one another through mutual aid.
共助の精神が地域コミュニティを支えている。
The spirit of mutual aid supports local communities.
自助・公助・共助の三つが社会を支える柱だ。
Self-help, public assistance, and mutual aid are the three pillars that support society.