Cusp is a point in time or position where something changes or shifts. Synonyms for cusp include the brink, verge, edge, threshold, tipping point, turning point, and crossroads. Each of these words implies a significant change or transition, and is often used to describe moments of uncertainty or unpredictability. The brink and verge suggest approaching a critical moment or an imminent event. The edge and threshold signify a boundary or limit that is about to be exceeded. The tipping point and turning point both imply a moment of decision or a key moment that determines the outcome of a situation. Finally, the crossroads is a place where multiple paths converge, and a choice must be made.