this phrase has shown up in two threads over the past couple of days, which prompts this comment/question: most dictionaries give the etymology of double entendre as an obsolete French phrase which translates as "double meaning", but in English usually implies that one meaning is indelicate.
I was surprised to discover in the OED that the original (obsolete) French phrase was double entente.

Why the change of words, and is neither expression extant in modern French?