Meanings
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" (1 Corinthians 15:52, KJV), referring to the last of seven trumpets to be sounded at the Last Judgement. The term used for the instrument in the original Koine Greek is σάλπιγξ (sálpinx), often translated as “war-trumpet”, but not resembling the modern instrument (see Seven trumpets on Wikipedia).
How to pronounce "last trump":
AU
The moment of God's final judgement on Earth.
A time that will never come; forever.
Example Sentences
1
We're running out of options; this is our last trump.
2
He played his last trump and won the game.
3
I was hoping to save that information until the last trump.
4
The team's coach is saving their star player for the last trump.
5
She kept her best argument for the last trump.