What is "roils"

Usage examples of "roils".

The stench of sulfur roils up and the gods and goddesses near the edge back away.

The board roils almost painfully in her sight, black print over silver-and-grey moire.

The ground roils under her feet, tipping her sideways, the air goes gluey, multileaved and flaking yellow-tinged as isinglass.

And still the glaring, blaring Thing lumbered across the low saddle, leaving smoking heather wherever its demon feet had trod, excreting fire and roils of noxious gases from somewhere beneath its awful bulk.

Yet even as the ground roils under Him, the ocean remains perfectly still.

The clouds were dark gray at their bases, rearing up in white roils as solid as rock but mutable, flowing continuously.