The mud held her fast and gave him no footing nor purchase.

He tried to put his feet against the rock to give himself additional purchase.

The creature's bill was slippery and gave little purchase to her claws.

Lucas dug away more packed snow to give his feet good purchase.

The chair swiveled, then caught and gave him purchase.

Somewhere they'd found some straw, which they had strewn about on the floor to give their hooves better purchase.

Some even think that choosing a new set of young pretenders gives him a bit more purchase on his seat.

That gave the leg purchase against the massive thrust it exerted a moment later.

The ledge, when he finally reached it, gave little purchase.

The angle of the half-bent knee that would give purchase when it was needed.