worsen /ˈwɜːsən/ ( worsening, worsened, worsens )

• 1. 

  V-T/V-I If a bad situation worsens or if something worsens it, it becomes more difficult, unpleasant, or unacceptable. 使变得更糟; 变得更糟

  例：

  The security forces had to intervene to prevent the situation worsening.

  那些安全部队不得不干预以阻止形势变得更糟。