work on
US /wɜːrk ɑːn/
UK /wɜːrk ɑːn/

1.
2.
trabalhar em, persuadir
to try to influence or persuade someone
:
•
I've been working on him to change his mind.
Tenho trabalhado nele para que mude de ideia.
•
She's been working on her parents to let her go to the party.
Ela tem trabalhado nos pais para que a deixem ir à festa.