Last-trump definitions

The moment of God's final judgement on Earth.
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(by extension) Forever.

We could wait until the last trump and no-one will turn up.

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Origin of last-trump

From The Bible, Paul's first letter to the Corinthians. We shall all be changed, in a moment, in the twinkling of an eye, at the last trump. KJV 1 Corinthians 15:52