Quote:
into the blue
At a far distance; into the unknown: spontaneously take a trip into the blue.
out of the blue
1. From an unexpected or unforeseen source: criticism that came out of the blue.
2. At a completely unexpected time: a long-unseen friend who appeared out of the blue.
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As has been stated, it means going into the unknown. But you have me intrigued. Why is the unknown 'Blue'? Blue is the colour of the sky, the sea & of the far distance (a blue haze on the horizon). Of course 'heaven' is blue & 'heaven' can refer to paradise, the sky or as a euphemism for the OtherWorld. Possibly in origin it referred to going into Faery/crossing into the otherworld?
Possibly not....
Cross-posted with Mith..