What exactly does "Pas de deux" mean?

Why is it that the French ballet dance called "Pas de deux" is supposed to mean "dance of two" when the French word for 'dance' is 'danse' and the English translation of 'pas' is not? When using online translation packages of French text to English, the English meaning of... show more Why is it that the French ballet dance called "Pas de deux" is supposed to mean "dance of two" when the French word for 'dance' is 'danse' and the English translation of 'pas' is not? When using online translation packages of French text to English, the English meaning of "Pas de deux" is "Not both".

I don't understand...
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