sucker punch

• 趁人不备时突然出拳击打，尤指在对方毫无防备时发动的偷袭；也引申指突然的、不公平的打击或意外挫折。

An unexpected punch or blow, especially one delivered without warning; also used figuratively to describe a sudden, unfair attack or setback.

1. Unexpected blowB2informal

   A sudden, unexpected punch or hit, often given when the recipient is not prepared.

   突袭

   • He was knocked out by a sucker punch in the bar fight.
   • The boxer was disqualified for throwing a sucker punch after the bell.
   • She caught him off guard with a sucker punch.

2. Unexpected setbackB2informal

   A sudden, surprising event that causes a major problem or disappointment.

   意外打击

   • The news of the layoffs was a real sucker punch for the team.
   • Losing the championship game was a sucker punch to their morale.
   • The sudden increase in rent was a sucker punch to their budget.