Apologies if you're actually French, just a simple language error.
Say someone in here were to back Stoke to beat Newcastle on Monday, if you were to "lay the opposite" you would be laying Newcastle to beat Stoke, which would have the draw in your favour, but you'd essentially want the same thing as that person, as a Stoke win would see you win.
Ha, no, not French. Just a mong gambler apparently. Just thought bet and lay were synonymous.