rus: как снег на голову

Information
has URI	http://lexvo.org/id/term/rus/%D0%BA%D0%B0%D0%BA%20%D1%81%D0%BD%D0%B5%D0%B3%20%D0%BD%D0%B0%20%D0%B3%D0%BE%D0%BB%D0%BE%D0%B2%D1%83

Meaning
means	(adverb) in a way that was not expected; "her brother showed up at the wedding out of the blue" unexpectedly, out of the blue