Last August President Barack Obama said that the use of chemical weapons in Syria would cross a red line. He repeated the phrase in December: red line.
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David Butterfield
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Why should the line be red and what happens if it is crossed? A simple, unhelpful answer is that the metaphor is taken from a safety gauge indicating a maximum speed, for an aeroplane perhaps, or for an engine’s revolutions. The big fat Oxford Dictionary in 20 volumes traces that figurative use back to the 1970s. But it seems at odds with a warning against chemical weapons. If Assad loosed off clouds of deadly gas, Mr Obama wouldn’t shout ‘Hey, slow down!’
Nor is the Obama red line related to the thin red line presented by the British Army to the Russians.
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