Nixing is a term used to mean "canceling" or "dismissing." It describes an action taken to reject something or bring it to an end. However, there are antonyms for this word that imply the opposite. Some such antonyms include approving, allowing, accepting, endorsing, and supporting. These words describe similar actions but with different meanings. Approving means giving the green light, while allowing is giving permission. Accepting implies taking something in, while endorsing is giving it your official support. Supporting means helping to sustain or promote something. In summary, the antonyms for nixing represent positive actions taken to accept, allow or endorse something.