hammer out
US /ˈhæm.ər aʊt/
UK /ˈhæm.ər aʊt/

1.
negociar, elaborar
to discuss and negotiate until an agreement is reached
:
•
They spent hours trying to hammer out a deal.
Pasaron horas tratando de negociar un acuerdo.
•
The committee needs to hammer out a new policy.
El comité necesita elaborar una nueva política.