While its origins are military, 锐不可当 is a versatile idiom used in many modern contexts. It is a formal and literary term, often appearing in news reports, formal speeches, and written articles.
Military and History: This remains a primary context, used to describe powerful armies or historical conquests.
Business and Economics: It's frequently used to describe a company's rapid growth, a product that dominates the market, or an economic trend that cannot be stopped.
Sports: A perfect term for a team on a winning streak, an offense that consistently scores, or an athlete at their absolute peak.
Social Trends and Technology: It can describe the powerful momentum of a new social movement, a viral trend, or the rapid adoption of a new technology.