Sunday punch

American  

noun

1. Boxing. the most powerful and effective punch of a boxer, especially the punch used in trying to gain a knockout.

2. anything, as an armed force, line of argument, etc., capable of inflicting a powerful blow on a hostile or opposing person or thing.

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Sunday punch British  

noun

1. boxing a heavy blow intended to knock out one's opponent

2. any manoeuvre or action intended to crush an opponent

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Etymology

Origin of Sunday punch

First recorded in 1930–35

Example Sentences

The takeaway: During your driver fitting don’t just focus on the distance number you get with your Sunday punch.

From Golf Digest • Jan. 2, 2020

Lockheed's Polaris missile is the Sunday punch of the nation's fastest-growing defense system, last year brought $372 million in sales for the company.

From Time Magazine Archive

This is the designation for an experimental missile that could, in the mid-1980s, become the Sunday punch of the U.S. arsenal.

From Time Magazine Archive

In the middle of a nation pursuing a faraway war in a faraway mood, a tough, hard-driving Air Force bombardment expert had tirelessly trained the Sunday punch to battle fitness.

From Time Magazine Archive

We knew the syllogism was the conclusion, the Sunday punch.

From The Kenzie Report by Clifton, Mark