beat the pants off
US /biːt ðə pænts ɔːf/
UK /biːt ðə pænts ɔːf/

1.
derrotar facilmente, dar uma surra
to defeat someone or something easily and decisively
:
•
Our team is going to beat the pants off the opposing team in the championship.
Nosso time vai derrotar facilmente o time adversário no campeonato.
•
She studied hard and managed to beat the pants off her classmates on the exam.
Ela estudou muito e conseguiu derrotar facilmente seus colegas de classe no exame.