thrash out
US /θræʃ aʊt/
UK /θræʃ aʊt/

1.
discutir, resolver
to discuss a problem or issue thoroughly in order to find a solution or reach an agreement
:
•
Let's thrash out the details of the new project tomorrow.
Vamos discutir os detalhes do novo projeto amanhã.
•
They need to thrash out their differences before the meeting.
Eles precisam resolver suas diferenças antes da reunião.