腹ふく心しんの友とも

expression, noun

close friend; trusted friend; confidant

A friend one can trust deeply, often used in literary or formal contexts. The phrase 腹心 (ふくしん) literally means 'belly and heart', implying someone who knows one's innermost thoughts.

• 彼かれは私わたしの腹ふく心しんの友ともであり、どんな秘ひ密みつでも打うち明あけられる。

  He is my trusted friend, and I can confide any secret in him.

• 腹ふく心しんの友ともと呼よべる人ひとはそう多おおくない。

  There aren't many people you can call a close friend.