"off dry"

"Vilco" inquired of the collective wisdom of the group .....

If one means the literal translation, demi-sec would mean "half dry" so the answer would be yes.

However, if one was referring to Champagne, then it takes on quite another meaning: sec indicates a relatively sweet wine, whereas demi-sec is even sweeter.

Et tu, Brut?

When it comes to Champagne, many people say they like dry, but really like a bit of sweetness. This perhaps explains why the real dryness/ sweetness of Champgne, at least that sold in many countries, does not agree very well with the words that describe it. Even Brut can have a touch of sweetness. Champagne tends to be a very acid wine, and a bit of sweetness often can make it seem more balanced and smooth. Only the best Champagne has the balance and lack of bitterness to show well with no added sweetness. A bit of sweetness can hide many sins in Champagne.