The phrase "dramatic sweep" refers to a situation or event that has a significant and noticeable impact over a wide area or range. It implies that something big or impressive is happening or has occurred, affecting many people or things.
The series is inspired by geometric patterns in nature including complex star and flower motifs, and features dramatic sweeping effects that give the images a sense of intense speed and fluid movement. (creativeboom.com)
Outfitted with dramatic sweeps of marble, the range and island become focal points. (bhg.com)