The term decrease implies a reduction or a decrease in the value or intensity of something. There are several antonyms for the word decrease, including increase, surge, growth, expansion, and rise. The opposite of a decrease is an increase, meaning a growth in quantity, value, or intensity. The term surge refers to a sudden and significant increase in something. Growth and expansion denote a gradual increase in size, volume, or quantity. A rise is an upward movement or an increase in value, importance, or influence. Using these antonyms, you can accurately reflect the opposite of a decrease in your writing, whether in a professional or personal context.