Ric tried to get up, but his feet kept slipping.

I'll lose my job if I keep slipping you drinks.

It was cold, too, and I kept slipping on the wet sidewalk.

When he tried to push himself to roll over all the way, though, his hands kept slipping on the fabric.

As if this problem wasn't bad enough, his mind kept slipping over to the saboteur.

One of the animals is still running round all the time, but it keeps slipping on the blood.

The audience for reality shows keeps slipping, and so does their shock value.

But he kept slipping out of focus, falling asleep really, and her voice was so beautiful.

Yes, that was it: the necessity kept slipping his mind.

Hard as I tried, they just kept slipping away.