What is the meaning of nix?

noun

• A quantity of no importance.
  • usage: "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it"
  • synonyms: nothing, nil, nada, null, aught, cipher, cypher, goose egg, naught, zero, zilch, zip, zippo

verb

• Command against.
  • usage: "I forbid you to call me late at night"; "Mother vetoed the trip to the chocolate store"; "Dad nixed our plans"
  • synonyms: forbid, prohibit, interdict, proscribe, veto, disallow