潤滑

1. Origins, structure, and basic meaning

• Structure: 潤滑, read じゅんかつ, denotes lubrication that smooths mechanical motion or figuratively eases relationships.
• Basic usage: It covers reducing gear friction with oil and figuratively smoothing relations between departments through dialogue.

2. Common pitfalls and similar expressions

• Mechanical and figurative smoothing
  • The basic sense is making motion smooth; 潤滑油 can figuratively describe something that eases human relations.