Elle me dit:
[Girl] "Claude M.C., est-ce que tu peux descendre?"
J'ai pris mon Magnum, j'ai dû mal comprendre

from MC Solaar – Bouge de là Lyrics on Rap Genius

Meaning

In this case “descendre” means to purposely kill the dog or to take the dog to Cassandre. MC Solaar hears this and takes his gun out.

Translation:
She says to me, “Claude MC, could you “bring/put” him down
I took out my Magnum, I had trouble understanding

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