IPA: /ˈwɜːrsən/
KK: /ˈwɜrsən/
To make something worse or to become worse.
The heavy rain will worsen the flooding in the area.
Past: worsened
Past Participle: worsened
Worsen → It is formed from "worse" (from Old English "wors", meaning of poorer quality or lower standard) and "-en" (a suffix used to form verbs indicating to make or become). The word "worsen" means to make or become worse or of poorer quality.
Think of something becoming 'of poorer quality' — 'worse' indicates a decline, and '-en' means to make or become.