Chanced

I chanced to see him in town.

I chanced on a beautiful girl.

I chanced to meet him at the airport.

I chanced to be working there.

It chanced that I met him at the airport.

I chanced talking to her.

It chanced that we were both traveling on the same train.

I chanced to see her on the street.

He chanced on a rare book at a second-hand bookstore.

In the middle of the crowd I chanced to catch a sight of Madonna.

He chanced upon the definition when leafing through the dictionary.