A kill shot that hits the front wall so close to the floor that it rolls back into the court rather than bouncing.

The total loss of rotational energy of a bowling ball on the backends, resulting in a flat hit.

The term used when the ball has lost energy or is hitting the pins with no force.

straighten by unrolling; "roll out the big map"

A ball that loses its side rotation before hitting the pins; the hook action stops at that point and the ball straightens out; generally undesirable; see also "hookout" and "hook and set".

A perfect kill shot that hits the front-wall floor so close to the floor that it rebounds without a bounce by rolling back into the court. A sure point because it is impossible to retrieve.