The stone hummed away and hit just below the top of the crenellated wall.

In the background the latest Beatles' success was humming away.

The printout was humming away even before I had finished speaking.

Indeed, Hun, eyes closed, humming away to herself, still hadn't seen them.

Fiona was humming away as she made the bed, having opened all of the windows to let in the warm spring day.

He took every bit of the hour, while the machines hummed away.

Kelly made an effort not to watch it hum away.

I had the sense of a tremendous energy - as if the whole crowded scene was humming and buzzing away.

He could make out the busy secret life inside each one, humming and spinning away, hidden from everyone but him.

The refrigerator belonged in a museum, but it still worked, the unit on its top humming away.