The idiom "on a knife-edge" draws its imagery from the sharp, thin edge of a knife, symbolizing a situation where something is in an extremely precarious and finely balanced state. Figuratively, it is used to describe a situation that is teetering on the brink of a major change, crisis, or critical decision, with the outcome uncertain and dependent on a delicate balance.

英語での「on a knife-edge」の定義と意味

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