throw up one's hands in horror
throw up one's hands in horror {v. phr.}
To be horrified; feel alarmed; give up hope of straightening things out; be shocked by something terrible.
When Mrs. Brown saw the mess the children were making in her living room, she threw up her hands in horror.
Everybody threw up their hands in horror at the destruction caused by the hurricane.
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Source: A Dictionary of American Idioms
