hammer away at

hammer away at idiom
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® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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