noun
a tool with a heavy metal head mounted at right angles at the end of a handle, used for jobs such as breaking things and driving in nails
verb
to persistently work at or criticize something
adverb
in a persistent or continuous manner
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The researchers continued to hammer away at the data until they found a significant pattern.
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He just kept hammering away at the problem until he finally figured it out.
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She's been hammering away at her guitar skills to get ready for the talent show.
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The politician's opponents constantly hammer away at his controversial statements.