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Difference between Come out of the blue and Get into a blue

come out of the bluehappen unexpectedly or without warning:

  • Nothing in my life ever came more “out of the blue” than my marriage.

get into a blue—(Austral. sl.) get into an argument; start a brawl:

  • Are red-haired people more likely to get into a blue?

See also: get one’s blue / get the blues.