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I have heard the draugr say this many times. Someone in whiterun refers loosely to what the draugr say. The draugr say "unslaad krosis" and the woman in whiterun says something along the lines of "season unending". I think both of these refer to the time of the return of the dragons. And with some draugr not coming back to life I think its more of them decaying easily compared to others or possibly the embalming process

So if people still look at this thread, I did some research and the draugr are placed in the tombs to keep the dragon priests at rest, whether the bodies were placed there willingly or with force is a mystery, but they were placed there to stop the dragon priests from waking up, but since Alduin came, the dragon priests have woken back up, that too is a mystery

but sometimes draugrs say "die intuder" and things like that as well. If you turn subtitles on it will show what enemies (in this case the Draugr) say. It´s easier to translate if you have the spelling in front of you (if you´re not good at Dovahzul then, or are a beginner)

just a tip

//Clara

If you're interested in Draugr, Amongst the Draugr is a must-read. It describes a reasearcher's forays into a Draugr-inhabited barrow.

Here are all lines of Draugr dialogue from the game with English translations. All of them are battle taunts:

• Dir volaan! 'Die, intruder!'
• Bolog aaz, mal lir! 'Beg (for) mercy, little worm!'
• Faaz! Paak! Dinok! 'Pain! Shame! Death!'
• Kren sosaal! 'Break (and) bleed!'
• Qiilaan us dilon! 'Bow before (the) dead!'
• Sovngarde saraan! 'Sovngarde awaits!'
• Daanik Kendov! 'Doomed Warrior!'
• Unslaad Krosis! 'Unending Sorrow!'
• Aav dilon! 'Join (the) dead!'

The Draugr should not be confused with the ghosts at Rannveig's Fast, who are unwillingly bound to a sorcerer.

That's odd, all of the sayings seem to be insulting or taunting you, except for "Unslaad krosis" which sounds like an apology. 

Deyruvthur

That's odd, all of the sayings seem to be insulting or taunting you, except for "Unslaad krosis" which sounds like an apology. 

Strangely enough, Paarthurnax does say unslaad krosis to express apology, but here I'm sure it's a taunt, meaning "you will have eternal sorrow!"

Good point, nox hi for the link to that book by the way, very interesting