riffle

A swift, shallow part of a stream causing broken water.

They then proceeded below the milldam, where there was a strong riffle, with likely looking pools and eddies

The big trout feed aggressively and tend to lose their caution in the rifles.

A succession of small waves.

A trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed. Also one of the cleats, grooves or steps in such trough.

A quick skim through the pages of a book.

Synonym of riffle shuffle

To flow over a swift, shallow part of a stream.

To ruffle with a rippling action.

To skim or flick through the pages of a book.

To leaf through rapidly.

Near-synonym: rifle

To shuffle playing cards by separating the deck in two and sliding the thumbs along the edges of the cards to mix the two parts.

In seal engraving, a small metal disc at the end of a tool.