The coup is a trump reducing play, the virtual discard of a trump by the declarer, because he has too many. This sound rather odd.
The only thing that distinguished a grand coup from its humbler brother, the coup, is that in the reducing play it is winners instead of losers that are ruffed.
Let us illustrate a grand coup, where South had to get rid of three superfluous trumps, in order to make his contract of 6:
 A Q 7  K 3  K Q 4  A Q 9 6 2 |
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 J 9 8 2  —  A 10 8 7 3 2  J 10 5 |
 10 4 3  Q 9 8 6  J 9 5  7 4 3 |
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 K 6 5  A J 10 7 5 4 2  6  K 8 |
Contract: 6Â by South
Lead: A
The A followed by the 2. At trick two South ruffs his good diamond. This play would be automatic with a first class player in this situation. Now a heart to the King reveals the position, the declarer has still two trumps too many.
A heart is lead and the 10 finessed. Dummy is re-entered with the Q, and the King of diamonds is lead and ruffed. This is followed by the K, and small to the Q, now the A is ruffed with the seven of trumps, leaving this position:
 A 7  9 6 |
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 J 9 8  —  10 |
 10 4  Q 9 |
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 K 6  A J |
Dummy is entered with the A and a good club is played. If East discards, so does South.
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