Daily
A quest that can be repeated once per day. These are usually level 70 and used for making money or gaining reputation with a faction
Crypts
Auchenai Crypts, an Auchindoun instance in Terokkar Forest
Critters
Low level creatures that don't attack players and don't give experience points.
Crit
Critical hit, an attack or spell that does increased damage or healing
CoW
Curse of Weakness, a warlock spell that decreases a target's attack power
CoT
Curse of Tongues, a warlock spell that causes the target to speak demonic, increasing cast time of spells. Also stands for Caverns of Time, a group of instances in Tanaris
CoS
Curse of Shadows, a warlock spell that increases shadow and arcane damage done to the target
CoR
Curse of Recklessness, a warlock spell that decreases a target's armor while increasing its attack power. Also makes the target not flee due to any fear effects
CoEx
Curse of Exhaustion, a warlock spell that slows movement. Requires a talent in the Affliction tree.
CoD
Curse of Doom, a warlock spell that does a large amount of damage after 60 seconds