ring off

A heart attack, she said, and rang off before he could ask questions.

He rang off before she could say any thing else.

He rang off before she had time to open her mouth.

I'll ring off now in case he's trying to get through to you.

Another call came through, and he had to ring off.

He rang off and sat for a time in thought.

We talked on to no point for a while longer, and then he rang off.

He talked to his small daughter for several minutes and then rang off.

He's all right, but I might have to ring off.

She was about to ring off when I stopped her.