go hang
go hang {v. phr.}, {slang}
1. To stop being of interest or importance; be forgotten. — Usually used with "let".
Mr. Johnson let his business go hang after his wife died.
2. To leave you alone; not bother.
When the neighbor told Father how to manage his children, Father told him to go hang.
Compare: TELL WHERE TO GET OFF.
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Source: A Dictionary of American Idioms