worsen
Definitions
To make or become worse.
To deteriorate in quality, condition, or severity.
Examples
The heavy rain is expected to worsen the flooding in the low-lying areas.
If you do not rest your injured ankle, the swelling will only worsen.
Synonyms
deteriorate aggravate exacerbate degenerate decline compound intensify
Antonyms
improve ameliorate better enhance alleviate mitigate recover