out of nowhere

(idiom) without warning

Example Sentences:

I was sitting at home, reading the newspaper, when out of nowhere my best friend from high-school called. I haven’t talked to her in 20 years!

Out of nowhere, the policeman ran into our office and began to chase the criminal.

Similar idioms:

1. out of the blue
2. up to (2)
3. run across
4. leave someone high and dry
5. cut to the chase