This verb in passive or middle voice means to be nourished, raised, or trained in something. First Timothy 4:6 encourages Timothy to be 'nourished up in the words of faith and good doctrine.' The term suggests ongoing formation through sustained exposure. Classical usage included being raised in certain practices or educated in particular teachings. Paul uses it to describe Timothy's continuous formation by sound doctrine, contrasting this wholesome diet with the poisonous myths he must reject.