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Idioms and Phrases with hammer away at

hammer away at

Keep at something continuously, as in The reporters hammered away at the candidate. This phrase employs hammer in the sense of “beat repeatedly,” a usage dating from the mid-1600s.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.