with a will

with a will idiom
Vigorously, energetically, as in He started pruning with a will. This term, first recorded in 1848, uses will in the sense of “determination.”

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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