The term SET ON EDGE can be defined by two crossword solutions: GRATE (5 letters) and UNNERVE (7 letters). GRATE means to reduce something into small pieces or fragments by rubbing it against a rough surface. This term is often used in cooking, where ingredients are grated to create a finer texture. UNNERVE means to make someone feel anxious or uneasy. It can also refer to making someone feel uncertain or insecure. Together, these two words describe the feeling of being set on edge, which is a state of heightened anxiety or unease.