根幹

1. Origins, structure, and basic meaning

• Structure: In 根幹 (こんかん), root 根 and trunk 幹 combine figuratively to denote a foundation or core.
• Basic usage: 根幹 is the fundamental core that supports an entire system, organization, or argument.

2. Common pitfalls and similar expressions

• Structural foundation and core
  • It carries greater structural importance than one detail or a visible surface feature.