The term upsurged signifies an increase or rise in something. Some antonyms for upsurged include decreased, declined, lowered, plummeted, and dropped. Decreased implies a reduction or a decline in something. Declined suggests a gradual decrease or a lessening of something. Lowered refers to a decrease or a reduction in something from a higher level or position. Plummeted means to suddenly drop or fall. Dropped refers to a decline or decrease in something that is usually steady. Antonyms for upsurged provide us with different ways to describe the opposite of a sudden increase in something, be it price, temperature, or any other measurable thing.