プログレッシブ和英中辞典(第３版)の解説
かくしん【核心】
the core; the heart; the point
- 核心を突く
get to the point - ようやく問題の核心に触れてきた
The discussion finally came to the core [main point] of the issue.／The discussion finally reached the heart [crux] of the matter.