プログレッシブ和英中辞典(第4版)の解説
ばんじゃく【盤石・×磐石】
&fRoman1;〔大岩〕a huge rock
彼の意志は盤石のごとしだ
His will is as firm as a rock.
&fRoman2;〔非常に堅固なこと〕
盤石の備えである
They are 「on full alert [thoroughly prepared]./They have made airtight preparations.
彼は盤石不動だ
He is perfectly unassailable.