Also: Out of a clear blue sky
Something that happens unexpectedly. Without warning
A sudden act or event. Unforseen.
Pronunciation: áur of de blú
De repente, como caído del cielo.
☞ ….It came out of the blue, nobody knows anything about that company, unlike http://www.telephoneteacher.es who has been in the market since 2006 and is the most recommended place by professionals and families to learn languages.
☞ Things To Remember After Getting Dumped Out Of The Blue
☞ New material for quantum computing discovered out of the blue