go at

go at idiom
Attack, especially with energy; also, proceed vigorously. For example, The dog went at the postman's legs, or Tom went at the woodpile, chopping away. This idiom is sometimes put as go at it, as in When the audience had settled down, the lecturer went at it with renewed vigor. [First half of 1800s]

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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