in due time Meaning & Origin | Slang by Dictionary.com

In the phrase in due time, the word due is used to mean “proper” or “rightful.” Therefore, in due time refers to a moment in time that is considered proper without specifically saying when that is.

The first records of in due time come from around 1387. The phrase was often used in religious texts to refer to God’s judgment or God’s will. Religious writers or preachers would remind people that God is immortal, so it may take a long time before He makes something happen or punishes someone but God will do so in due time.

Today, we still commonly use in due time when we know (or think we know) something will happen at some point but we aren’t sure how soon that time will come.