“They just contacted me out of the blue.”
You just started a new job. Your friend asks you how you found it. You tell her that a recruiting company contacted you unexpectedly a few months ago.
They just contacted me out of the blue.
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To "contact" someone means to call, email, or send a letter to them. Those words are all specific, but "contact" can mean all three.
In more casual speech, the phrase "get in touch with ___" can be used to mean "contact ___".
(something) just (does something)
One of the many ways to use the word "just" is to talk about something that happens suddenly:
He was there, and then he just vanished.
It just stopped working all of a sudden.
out of the blue
This idiom means ‘suddenly’ or ‘unexpectedly'.
And then out of the blue she decided she wanted to be a nurse instead.
He was doing fine and then out of the blue started getting these severe pains.