Title says it all. But I've got a Barbarian/Rogue in my campaign. If he's raging and gets smacked in the face with a hammer for 20 damage, half to 10 because of rage, then uncanny dodge to halve that to only 5 points of damage?
Rogue/Barb is a lovely combo. Reckless Attack using Strength with a Finesse weapon for on demand Sneak attacks, Expertise and Advantage on Grapples and Shoves, and the aforementioned Double damage Reduction.