"Sweeping the country" is a phrase often used to indicate the widespread and rapid spread of a trend, idea or policy. Synonyms for this expression include words and phrases such as "taking the nation by storm," "catching on like wildfire," "spreading like a contagion," "catching fire" and "going viral." These synonyms all emphasize the idea of something spreading quickly and extensively across the nation. They are often used in news reports, advertising and social media to describe everything from political movements to viral trends in popular music and entertainment. Using these synonyms can add color and a sense of urgency to any text.