(かなめ)

かなめ
noun
pivot; key point; linchpin
See also: (よう) (necessity, need)
1. pivot; key point; linchpin; crux
The most important or central element of something — the part that holds everything together. Originally referred to the rivet of a folding fan.
(かれ)はチームの(かなめ)だ。
He is the linchpin of the team.
交渉(こうしょう)(かなめ)信頼関係(しんらいかんけい)だ。
The key to negotiation is a relationship of trust.
防衛(ぼうえい)(かなめ)となる地域(ちいき)確保(かくほ)しなければならない。
We must secure the region that serves as the linchpin of defense.

The crucial element that everything depends on. Originally the rivet ((かなめ)) of a folding fan ((おうぎ)) — the small pin at the base that holds all the blades together. Without it, the fan falls apart, hence the figurative meaning.

COMMON COLLOCATIONS:

  • チームの(かなめ) — linchpin of the team
  • 組織(そしき)(かなめ) — the key person/element of an organization
  • 防衛(ぼうえい)(かなめ) — linchpin of defense
  • (かなめ)となる — to serve as the key element
  • (おうぎ)(かなめ) — the pivot of a fan (also figurative: the central hub)

ETYMOLOGY:
From the rivet ((かなめ)) of a folding fan. The metaphor of a small but essential component holding a larger structure together is the core of this word's meaning.

SIMILAR WORDS:

  • (よう) — necessity, need (same kanji, on'yomi reading, different nuance)
  • 中心(ちゅうしん) — center, core (more neutral, less emphasis on indispensability)
  • (はしら) — pillar (similar metaphor of structural support)

AS A NAME:
(かなめ) is also used as a given name (for both genders), suggesting someone essential or pivotal.