judgement day is not in our dictionary (yet). Here's what it could mean:

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noun

In some religious beliefs, the time of God's final verdict on the world and all its people.
A time of final reckoning or a moment when a crucial, irreversible decision is made.

Examples are provided to illustrate usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

And what stands between these tiny squeakers and that judgement day is… just us.

From BBC ● Dec. 23, 2018

I will be with you until my judgement day.

From New York Times ● Mar. 22, 2018