worsen[
'wә:sn]
vt. 使更坏, 使恶

vi. 
更坏, 恶
[
] 恶

worsen
[ verb ]
- grow worse
<verb.change> decline
Conditions in the slum worsened
- make worse
<verb.change> aggravate exacerbate exasperate
This drug aggravates the pain

Worsen \Wors"en\, 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. --Southey.
2. To get the better of; to worst. [R.]
Worsen \Wors"en\, v. i.
To grow or become worse. --De Quincey.
Indifferent health, which seemed rather to worsen than
improve. --Carlyle.