any frame in which a bowler fails to make a strike or spare; "the break in the eighth frame cost him the match"

If you fail to make your spare, i.e. knock all pins down in two shots, it is called an open frame

a frame where there is not a spare or a strike scored

An opportunity for trainees to raise any comments or questions about the material that interests them.

A power supply where there is no external metal chassis; the power supply is provided to the end user essentially as a printed circuit board which provides mechanical support as well as supporting the components and making electrical connections.