stumbling upon

Stumbling upon a reported beheading in progress, an aspiring London rapper live-tweeted the attack.

But stumbling upon a film with four vibrant, fresh, funny female characters is cause for celebration.

Locating it would have been comparable to stumbling upon a solitary blade of grass, imbedded in ice at the South Pole.

I hadn't dreamed of stumbling upon anything like this when I started out to shadow Kestler.

I was always stumbling upon it in new combinations and unaccustomed places, and I never could get used to its vagaries.

"You cannot keep a secret, Mr. Hall," said she, stumbling upon him as she entered the drawing-room.

He never knew how near he came to stumbling upon the nest, before Bobby played that trick on him.