put one's back into it
American Heritage Dictionary of Idioms:
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put one's back into it
Make a strenuous effort, as in If you put your back into that report, you'll soon be done. This idiom alludes to physical labor involving the strength of one's back. It was first recorded in 1882.
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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