金鉄

きんてつ【金鉄】

〔金と鉄〕 gold and iron; metals; 〔堅固〕 firmness.

●金鉄の誓い a steadfast promise [vow, pledge]

・金鉄の守り rock-solid defense

・金鉄の意志をもつ have an adamantine will; be a person of iron will

・男児の一言金鉄のごとしだ. A man's word should be as firm as steel.