stumble across

The young guard appears to have had the misfortune to stumble across an undercover Israeli operation, during which he was shot and killed.

Come May in Seattle, you can’t help but stumble across flowers bursting out of every yard.

In response to a comment, Robinson said he didn't stumble across the image.

Occasionally, I stumble across food safety headlines that make me do a double-take because they are lauding a measure that seems like it should have been standardized long ago.

In this sequence from the writer and director Alex Garland’s latest film, “Civil War,” about a modern-day conflict that has broken out in America, journalists making their way to Washington, D.C., stumble across a field set up with Christmas decorations.