n.

1. （尤指核武器）过度的杀伤威力

vt.

1. 过度地杀伤
2. 过分；夸张
   The candidate used overkill: he was way ahead in the polls but spent another million dollers on campaign ads.

   那个候选人花得过火了：他已经领先他人却又花了一百万元在宣传费上。

   That's overkill; she dressed up like a princess for the party.

   她打扮得像个公主一样去参加宴会，真是太夸张了。

n.

1. excessive use, treatment, or action.
2. the amount by which destruction or the capacity for destruction exceeds what is necessary.