潤滑(じゅんかつ)

Compound of 潤(じゅん) ('moisten/enrich') and 滑(かつ) ('slide/smooth'). Literally 'moistening and sliding'.

Usage

• Almost never used as a standalone noun. The most common form is the compound 潤滑(じゅんかつ)油(ゆ) or 潤滑剤(じゅんかつざい) ('lubricant').
• The figurative phrase 潤滑油(じゅんかつゆ) (or ...の潤滑油(じゅんかつゆ)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(じゅんかつ)する exists but is rare; 潤滑(じゅんかつ)させる ('to lubricate / smooth the working of') appears in technical writing.

Common collocations

• 潤滑(じゅんかつ)油(ゆ): lubricating oil
• 潤滑(じゅんかつ)剤(ざい): lubricant
• 潤滑(じゅんかつ)作用(さよう): lubricating action
• 人間関係(にんげんかんけい)の潤滑(じゅんかつ)油(ゆ): lubricant of human relationships (figurative)
• 組織(そしき)の潤滑(じゅんかつ)油(ゆ)となる: to become the lubricant of an organization

Related words

• 摩擦(まさつ): friction — the opposite effect that lubrication reduces.
• 円滑(えんかつ): 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(えんかつ)な進行(しんこう) 'smooth progress'), while 潤滑(じゅんかつ) emphasizes the agent that makes things smooth.
• 滑(なめ)らか: smooth, slick — describes surfaces or motion directly.