She began to feel like a fool for keeping him on the line.

"Keep him on the line until we've got the location."

I don't like to keep it on the line at maximum level for very long now.

The important thing was to keep him on the line, not to lose his trust.

He wanted to say something else, anything, to keep her on the line, but words eluded him.

He'd keep the guy on the line until they got there.

Or are you planning to just keep him on the line for the rest of the day?

The longer you keep him on the line, the better.

My record for keeping them on the line is 14 minutes.

She tried to get off the telephone but he kept her on the line.