Meaning : Command against.
I forbid you to call me late at night.
Mother vetoed the trip to the chocolate store.
Dad nixed our plans.
Meaning : A quantity of no importance.
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.
Nix ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Nix ka matlab kya hota hai?