The term 'Big Rush' can be summarized by two crossword solutions: SPATE and BLITZ. SPATE is a noun meaning a sudden, great increase or outpouring of something, while BLITZ is a noun meaning a swift, concentrated military offensive. Both words are used to describe a situation of intense activity or demand. The term 'Big Rush' is often used to refer to a period of time when there is a large amount of activity or demand, such as a rush of customers in a store or a rush of orders for a product.