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"hammer away" is perfectly correct and usable in written English.
It is used in the context of "persistently continue doing something". For example, "He hammered away at the old door until it finally gave way". You can also use "hammer away" to mean "work hard" as in, "I'm going to hammer away all night to finish this project".
Exact(60)
Exigencies of living hammer away impatiently.
Bands hammer away in several rooms, and everybody dances.
"I hammer away, and it's hard on people.
But we're going to still hammer away at it".
Mr. Kerry, meanwhile, continued to hammer away on the issue.
"But they always hammer away at the government's failure to meet its burden of proof".
Like Del Potro, Nadal's strategy against Federer is to hammer away at Federer's backhand.
Even then, he said, "it was just a pleasure to hammer away and make shapes".
The main focus of Stakhovsky's winning strategy was to hammer away at Federer's weaker backhand return.
Business leaders hammer away at the urgent need for structural reform.
"Saracens hammer away on this and the coaches have got on board with it.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com