impregnable castle; impregnable fortress
Figurative or literal: a castle so strong it cannot be taken. Often used metaphorically for an unassailable position or stronghold.
この要塞はまさに金城だ。
This fortress is truly an impregnable castle.
彼の守備
They turned the mountain castle into an impregnable stronghold to prepare against enemy invasion.
His defense is like an impregnable fortress.
inner citadel; inner castle
Historical term for the innermost fortified area of a Japanese castle, the last defensive stronghold.
金城は城の最も堅固な部分だ。
The inner citadel is the most fortified part of the castle.
Golden Castle; Nagoya Castle
Nickname for Nagoya Castle, referring to its golden shachihoko ornaments. Used in tourism and historical contexts.
金城は名古屋のシンボルです。
The Golden Castle is a symbol of Nagoya.
本丸 is the standard castle-terminology word for the innermost bailey, whereas 金城 is a more literary or figurative term for the same inner stronghold.
impregnable fortress; unassailable stronghold
impregnable castle walls · impregnable; invulnerable; unassailable
From 金 (kin, 'gold' or 'metal') and 城 (jō, 'castle'), literally 'golden castle' or 'metal castle'. The sense of 'impregnable' comes from the idea of a castle as strong as metal.