Examples of use of cusp-
1. "Anthony stood at the cusp of a successful career.
2. These are people on the cusp of release back into society.
3. "Despite some of the reporting that we‘re on the cusp of some agreement, that ain‘t true.
4. If Sony are right, we are on the cusp of an explosion of urban gaming.
5. But experts say Japan is on the cusp of its own crisis.