Last Updated：2025/11/20

A key designed to open a set of several locks; a passkey. / (figuratively) Any tool or technique that can solve many types of difficulty.

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master key

Source Word

master key

figuratively slang

Japanese Meaning

複数の錠（ロック）を開けることができる鍵、すなわち万能鍵。 / 比喩的な意味では、さまざまな問題を解決できる手段や技術を指す。

The janitor kept the master key in a drawer so he could access any office after hours.

管理人は、閉館後にどのオフィスにも入れるように、複数の錠を開けるための鍵を引き出しにしまっておいた。

Sense（1）

A key designed to open a set of several locks; a passkey.

Sense（2）

(figuratively) Any tool or technique that can solve many types of difficulty.

Sense（3）

(law enforcement, slang) A shotgun shell designed for breaching doors.

master keys

（ plural ）