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gatekeeper (B2)

カタカナ: ゲートキーパー

IPA: /ˈɡeɪtˌkiːpər/

A person or entity that controls access to something, often by deciding who or what is allowed to pass through or participate.

意味: 何かへのアクセスを制御し、誰が通るか、何が参加できるかを決定する人や組織。

In many medical systems, the primary care physician acts as a gatekeeper for specialist services. — 多くの医療制度において、かかりつけ医は専門医のサービスを受けるための門番（ゲートキーパー）の役割を果たしている。
The security guard serves as the gatekeeper for the private community, verifying every visitor's identity. — 警備員はプライベートコミュニティの門番として、訪問者全員の身元を確認している。
Social media algorithms have become the new gatekeepers of public discourse and information flow. — SNSのアルゴリズムは、公的な議論や情報の流れを左右する新たなゲートキーパーとなった。

Japanese translations of Gatekeeper:

act as a gatekeeper (collocation): to perform the function of controlling access — "Parents must act as gatekeepers for the content their children consume online."
gatekeeper of (prepositional phrase): the person or thing controlling access to a specific domain — "The professor is the gatekeeper of the department's research funding."