Definition of hammer away at phrasal verb from the Oxford Advanced Learner's Dictionary

 

hammer away at

 phrasal verb
phrasal verb
 
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Phrasal Verbs

hammer away at something

 
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to work hard in order to finish or achieve something; to keep repeating something in order to get the result that you want She kept hammering away at that point all through the meeting.
See the Oxford Advanced American Dictionary entry: hammer away at