ばんじゃく[盤石, 磐石] …に対して盤石の備えをしている［＝油断なく警戒している］ be on (the) alert for ［against］ ...

ばんじゃく〔盤石〕 〈名〉(不動の盤石は)the living rock:(堅牢の盤石は)adamant:(依頼すべき盤石は)the “Rock of Ages” ◆我が主義の動かざること盤石の如し　My principles are immovable as the living rock―firm as a rock. ◆その立論盤石の如し　His is an adamatine position. ◆無常の世に棲む人は依頼すべき盤石を得て始めて安心立命あり　Man can not attain calm resignation in this mutable world till he has found his “Rock of Ages.”