rift

A shallow area in a waterway.

The backwash of a wave that has broken upon a beach.

A fissure, crack, or opening, as in rock.

A break in friendly relations.

An area where the lithosphere is thinning, typically associated with large faults and grabens.

To split open; break.

To cause to split open or break.

An opening made by riving or splitting; a fissure; a cleft or crevice; a chink.

A riving or splitting; a shattering.

To rive; cleave; split.