From Longman Dictionary of Contemporary Englishuppercutup‧per‧cut /ˈʌpəkʌt $ -ər-/ noun [countable] DSa way of hitting someone in which you swing your hand up into their chin
Examples from the Corpus
uppercut• I threw two left hooks, one uppercut and a straight right.• Tyson landed one punch after the other until a perfect right uppercut almost sent Bruno out of the ring.• In the third, Tyson initiated an unanswered barrage with two left hooks and finished it with the right uppercut. 