be news to

be news to (one)

To be something that one was not aware of or did not know. A: "Yeah, Jeff and Anthony have been going out for a few months now." B: "Well, that's news to me. I thought they were just friends." You aren't allowed to dump your grass clippings here? Well, that's news to me!
See also: news

be news to

be information not previously known to (someone), and perhaps regarded as implausible. informal
2004 NZine – New Zealand Ezine This was the first we had heard about it, and indeed it was news to the local community and the Hurunui District Council.
See also: news