Sunday punch
noun/ˌsʌndeɪ ˈpʌntʃ/, /ˌsʌndi ˈpʌntʃ/
/ˌsʌndeɪ ˈpʌntʃ/, /ˌsʌndi ˈpʌntʃ/
(informal, especially US English)- an especially hard hit or attack
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Sunday punch
Definition of Sunday punch noun from the Oxford Advanced Learner's Dictionary