The phrase 'get due' is typically used in the context of receiving what is owed or deserved. There are a variety of synonyms that can be used to convey this meaning, including 'receive justice,' 'get what's coming to you,' 'earn your just deserts,' and 'reap what you sow.' Other options include 'get what you deserve,' 'receive your rightful dues,' 'collect your rightful rewards,' and 'get your just reward.' Regardless of the specific words used, these synonyms all convey the idea that someone is receiving what they are owed or what they have rightfully earned.