have at

have at idiom
Attack; also, make an attempt at. For example, Urging the dog on, he said, “Go on, Rover, have at him,” or It's time to have at straightening out these files. [Late 1300s]

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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