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

1.
discutir a fondo, 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 a discutir a fondo los detalles del nuevo proyecto mañana.
•
They need to thrash out their differences before the meeting.
Necesitan resolver sus diferencias antes de la reunión.