We'll keep you here 'til then, by force if necessary.

I thought perhaps they were keeping her there by force, but the way she acted didn't fit in with that.

So they kept me by force near half an hour.

I was beginning to feel very weak and wanted to leave but they kept me by force.

I told him that he could keep me only by force.

Earth's population kept itself stable, by force when necessary.

When she spoke, she kept her voice calm by force of will.

He wanted to keep himself in power by force.

We attempted to keep them back by force but then they used their hypnobeamers.

And he'd keep her with him by force if he had to.