Definition from Wiktionary, the free dictionary
- (idiomatic) An unexpected punch or similar blow.
2011 January 8, Chris Bevan, “Arsenal 1 - 1 Leeds”, BBC:
- The Championship highflyers almost got their reward for a resilient performance on their first visit to the Emirates, surviving a flurry of first-half Arsenal chances before hitting back with a classic sucker punch.
- (idiomatic) A disabling punch targeting a place which is not normally acceptable in a "fair fight", such as on the back of the head.
- (punch in a place that is not a target in a fair fight): rabbit punch