trail away
trail off

But sales of the book and video began to trail off.

I stopped talking finally, my voice sort of trailing off.

Looking up at him, she let her words trail off.

The last trailed off into something none of them could make out.

At the look on her face, his voice trailed off.

Her voice trailed off as she read the answer in the woman's dark eyes.

The voice trails off as he comes within arm's reach.

He's about to say something else, but his voice trails off.

When she would turn her back I'd trail off after them again.

His voice trailed off as if he didn't want to talk about it any further.