Unexpectedly or without warning; something that happens suddenly and without any indication that it would occur.
When do you use "Out of the blue"?
This phrase is appropriate when describing events or occurrences that happen unexpectedly, such as surprise announcements, sudden changes, or unanticipated news.
"Out of the blue" Usage Examples
I was completely taken aback when my old friend called me out of the blue after five years.
The job offer came out of the blue; I hadn't even applied for any positions.
Her decision to move to another country came out of the blue and surprised everyone.
They broke up out of the blue, leaving their friends in shock.
Out of the blue, he proposed during their picnic, catching her off guard.
"Out of the blue" Explained
The phrase 'out of the blue' likely originates from the expression 'blue sky', which is associated with clear, calm weather. In this context, something appearing 'out of the blue' implies that it comes from a clear, unclouded place, much like a sudden event that occurs without any prior signs or warnings. It has been used in literature and conversation since at least the early 20th century.