The idiom "under the radar" originates from military aviation, referring to flying at an altitude or in a manner that avoids detection by radar systems. The phrase has since evolved into a metaphorical expression, signifying actions or activities that go unnoticed or escape attention, often intentionally. In a broader context, "under the radar" suggests a subtle or inconspicuous approach, allowing someone or something to operate discreetly or avoid scrutiny.

英語での「under the radar」の定義と意味

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