1.
lubrication — reducing friction between moving parts, or (figuratively) the smooth operation of a system
The act or state of making motion smooth by reducing friction. Used literally for machinery (oil between moving parts) and figuratively for the smooth running of organizations, communication, or relationships. Rarely appears as a standalone predicate — almost always found in compounds or in the phrase 潤滑油 ('lubricating oil').
潤滑油を差す。
To apply lubricating oil.
このベアリングには定期的な潤滑が必要だ。
This bearing needs regular lubrication.
挨拶は人間関係の潤滑油だとよく言われる。
It is often said that greetings are the lubricant of human relationships.
Compound of 潤 ('moisten/enrich') and 滑 ('slide/smooth'). Literally 'moistening and sliding'.
USAGE:
- Almost never used as a standalone noun. The most common form is the compound 潤滑油 or 潤滑剤 ('lubricant').
- The figurative phrase 潤滑油 (or ...の}{潤滑油{になる}) is idiomatic — used to describe something or someone that helps interactions or systems run smoothly, such as a mediator, a helpful custom, or small talk.
- The する-verb form 潤滑する exists but is rare; 潤滑{させる} ('to lubricate / smooth the working of') appears in technical writing.
COMMON COLLOCATIONS:
- 潤滑油: lubricating oil
- 潤滑剤: lubricant
- 潤滑作用: lubricating action
- 人間関係の潤滑油: lubricant of human relationships (figurative)
- 組織の潤滑油{となる}: to become the lubricant of an organization
RELATED TERMS:
- 摩擦: friction — the opposite effect that lubrication reduces.
- 円滑: smooth (running) — very close in meaning, but more often used as an adjective-na to describe the smooth course of events or communication (e.g., 円滑な}{進行 'smooth progress'), while 潤滑 emphasizes the agent that makes things smooth.
- 滑らか: smooth, slick — describes surfaces or motion directly.