save someone's ass
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save (one's) ass
rude slang To rescue one from failure, danger, or disaster; to prevent something bad from happening to one. Thanks for bringing me some extra cash—you really saved my ass, there! The company is in dire need of new investors to save their ass.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
save someone's assor
save someone's buttmainly AMERICAN, INFORMAL, RUDE
If you save someone's ass or save their butt, you save them from a dangerous or unpleasant situation. Howard rushed up to me and said, `Thank you, thank you, you saved my ass.' You should be grateful — I saved your butt! Note: You can also say that you save your own ass, meaning that you escape from a dangerous or unpleasant situation. She climbed out the back of the car to get away, to save her own ass.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012