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совершенно неожиданноstresses
gen. out of a clear sky; out of the blue; out of clear blue sky (Interex); the last thing; all of a sudden (Charlene from Pico Rivera, California shared a bizarre experience she had some years ago while sitting in the lounge with the teaching staff of a preschool. "All of a sudden out of nowhere was a very thunderously loud crash of glass," she recalled, noting everyone went off to investigate the source of the noise but found nothing that could have made such a racket. "It seemed to be contained in that room where we were," she explained, adding it should have awakened the sleeping children. coasttocoastam.com ART Vancouver); out of thin air
Игорь Миг come out of the blue (появиться/возникнуть/случиться)
amer. out of thin air (Your cousin arrived out of thin air. Val_Ships)
slang right out of the blue
совершенно неожиданно: 15 phrases in 5 subjects
General5
Makarov5
Mathematics2
Programming1
Slang2