the shirt off back
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the shirt off (one's) back
Anything or everything one owns or has to offer. Those contractors will take the shirt off your back if you hire them. I mean, I paid them an exorbitant amount of money, and look at the shoddy work they did! I'm not surprised that Tammy loaned you money—she would give you the shirt off her back if you needed it.
the shirt off (one's) backSlang
The maximum one is able to give or lose: The only thing those swindlers didn't take was the shirt off my back.