1. A cheap shot that is illegal or after the bell rings.
2. During a series of right jabs and straights, a heavy and hard left hand that is unseen and does serious damage could be considered a sucker punch.
3. When a boxer is taking a lot of damage from unbroken combinations and he lands one good counter punch that stuns or knocks out his opponent is a sucker punch.
A punch for a sucker
A sucker punch is where some one throws a cheap shot at an unsuspecting victim, hence 'Sucker punch'
Sucker punch is when your opponent is dominating you in a particular sport, like in Boxing, and embarrassing you, and with just one punch, you knock him out.
A haymaker or one punch that ends a fight quite unexpectedly.
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I will show you