The phrase "deal one in" means to invite someone to join or participate in something, usually a game or activity. Some antonyms for this phrase might include "exclude," "reject," or "dismiss," which would indicate a refusal to invite or include someone in the activity. Alternatively, antonyms might include "opt-out," "decline," or "abstain," which would indicate a decision not to participate or be involved. Depending on the context, other antonyms might be relevant, such as "bow out," "withdraw," or "disengage," all of which imply a decision to remove oneself from a situation or activity.