筋すじ金がね入いり

noun which may take the genitive case particle 'no', noun

staunch; hardcore; dyed-in-the-wool

Describes a person who is deeply committed, unwavering, or thoroughly imbued with a certain quality or ideology. Often used with nouns like 保守派 (conservative), ファン (fan), etc.

• 彼かれは筋すじ金がね入いりの保ほ守しゅ派はだ。

  He is a dyed-in-the-wool conservative.

• 筋すじ金がね入いりの野や球きゅうファンとして、毎まい試し合あい欠かかさず見みている。

  As a hardcore baseball fan, I watch every game without fail.

noun

metal reinforcement

Original literal meaning: having metal wires or bars embedded for strength. Now mainly used in historical or technical contexts, such as describing reinforced concrete or traditional construction.

• この古ふるい扉とびらは筋すじ金がね入いりで、とても頑がん丈じょうだ。

  This old door is reinforced with metal and very sturdy.