골수

〔骨髓〕

[골쑤]

1. bone marrow
Soft substance filling in the center of a bone.

2. depth of one's heart
(figurative) One's innermost thought.

3. core; keypoint
(figurative) The most important point in a speech, a piece of writing, or an incident.

4. hardcore believer
(figurative) A person who believes and follows a certain idea, organization, person, etc.