The term "up surges" refers to a sudden increase or rise in something. The term "downfall" is a possible antonym for this word. It is a term used to describe a sudden drop or decline in something. Another term that is the opposite of "up surges" is "decline," which means a gradual decrease in something. "Downturn" is another opposite to "up surges," which means a decline or recession in an economy, market, or business. The term "reduction" also fits this category as it refers to a decrease or lowering of something. In contrast, "up surges" have the opposite effect in raising or lifting up something.