Worsen /(?)/

Wors·en

Worsen

v. t.
  1. To make worse; to deteriorate; to impair.
    It is apparent that, in the particular point of which we have been conversing, their condition is greatly worsened.
  2. To get the better of; to worst. [R.]

Worsen

v. i.
  1. To grow or become worse.
    Indifferent health, which seemed rather to worsen than improve.