From Longman Dictionary of Contemporary Englishhammer something ↔ out phrasal verbDISCUSSto decide on an agreement, contract etc after a lot of discussion and disagreement Leading oil producers tried to hammer out a deal. → hammer→ See Verb table
Examples from the Corpus
hammer out• It just caught me by the scruff of the neck and practically hammered my guts out.• The film was immensely popular and had so clearly struck a chord that Hammer carried out a rethink of its production policy.• Our blood tastes of rusted weapons and hammered - out coins.• John Henry threw his hammer and snuffed out the fuse.From Longman Business Dictionaryhammer something → out phrasal verb [transitive] to decide on an agreement, contract etc after a lot of discussion and disagreementThe two companies will take several months to hammer out an agreement for splitting the profits. → hammer→ See Verb table 