to reject, cancel, or say no to something; to put an end to a plan or idea.
From German 'nichts' meaning 'nothing,' popularized in American English in the 1800s as slang for rejecting or dismissing something, likely influenced by Yiddish usage.
The word 'nix' became super popular during Prohibition when speakeasies used it as code to warn others that police were coming—basically 'nix it' meant hide everything. It's one of those words that started as underground slang and became totally mainstream.
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