noun
tree trunk; bole
The main woody stem of a tree, as opposed to branches, leaves, or roots.
子どもが太い幹に手を回した。
The child put his arms around the thick tree trunk.
この木は幹がまっすぐ伸びている。
This tree has a trunk that grows straight up.
noun
A figurative extension from a tree trunk: the main supporting part or backbone of an organization, activity, plan, or system. More metaphorical than 基盤 or 根幹.
この事業は会社の幹となっている。
This business has become the backbone of the company.
教育は国づくりの幹だと彼は考えている。
He believes education is the foundation of nation-building.