‘pinky swear’: meaning and origin

USA—also ‘pinky promise’—a binding promise made while linking one’s little finger with that of another person—‘pinky’ designates the little finger

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‘under the radar’: meaning and origin

USA, 1969—the phrases ‘off the radar’, ‘under the radar’ and ‘below the radar’ are used of something or someone that cannot be detected—the reference is to an aircraft flying too low to be detected by a radar

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