tree trunk; bole
The main woody stem of a tree, as opposed to branches, leaves, or roots.
The child put his arms around the thick tree trunk.
This tree has a trunk that grows straight up.
backbone; foundation; central support
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.
This business has become the backbone of the company.
He believes education is the foundation of nation-building.
This tree has a very thick trunk.
This business is the backbone of the company.
I cut the trunk of the tree that had fallen in the typhoon.