beat up on
US /biːt ʌp ɑːn/
UK /biːt ʌp ɑːn/

1.
golpear, apalear
to repeatedly hit or kick someone or something
:
•
The bullies would always beat up on the smaller kids.
Los matones siempre golpeaban a los niños más pequeños.
•
He got beat up on his way home from the party.
Fue golpeado de camino a casa desde la fiesta.
2.
criticar duramente, machacar
to criticize someone severely or repeatedly
:
•
The media continued to beat up on the politician for his controversial statements.
Los medios continuaron criticando duramente al político por sus declaraciones controvertidas.
•
It's not fair to always beat up on him when things go wrong.
No es justo siempre criticarlo cuando las cosas salen mal.