Translation guide
A person or thing that is essential to the success or functioning of an organization, plan, or system.
Referring to someone or something that holds everything together and without which everything would fail.
Literally 'pivot' or 'rivet', used metaphorically for the central, indispensable element. Very common and natural.
彼がチームの要だ。
He is the linchpin of the team.
この計画の要は資金調達です。
The linchpin of this plan is fundraising.
An indispensable presence. Emphasizes that the person or thing cannot be done without.
彼女はチームに欠かせない存在だ。
She is the linchpin of the team.
The English word 'linchpin' originally refers to a pin used to keep a wheel on an axle. This literal meaning is rarely used in modern English and has no direct, commonly used Japanese equivalent. In Japanese, always use a metaphorical term like 要 (かなめ) or キーパーソン for the figurative sense.
Loanword from English 'key person'. Used specifically for a person who is crucial, often in business or project contexts.
彼女はプロジェクトのキーパーソンだ。
She is the linchpin of the project.
Central figure or key person. Slightly more formal, often used in organizational contexts.
彼は会社の中心人物です。
He is the linchpin of the company.
Literally 'central pillar', originally referring to the main pillar of a traditional house. Metaphorically, the mainstay or breadwinner of a family or organization. Has a slightly traditional or familial nuance.
父は家族の大黒柱だ。
My father is the linchpin of our family.