giant killer

Translations
гигантоубийца
The underdog team played like giant killers, defeating the reigning champions.
Команда-аутсайдер играла как гигантоубийцы, победив действующих чемпионов.
Definitions
A 'giant killer' is a person, team, or thing that defeats someone or something much more powerful or favored, especially in sports or competitions.
Words
giant

adjective
гигантский
killer

noun
убийца