put your back into something
put (one's) back into (something)
To put a lot of effort into doing something as quickly or effectively as possible. Come on, we need to get this car off the road. Put your back into it and push! It's clear that the legislators have put their backs into crafting a bill that will find support across party lines, as well as in the general population.
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put your back into somethingINFORMAL
If you put your back into something, you work very hard to do it. Eighty miles across the mountains could be done in six days walking, if she put her back into it. It just shows what can be achieved when people commit to something and put their backs into it.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
put your ˈback into somethingwork very hard at something: We’ll get the job finished today if we put our backs into it.
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